Good info, I have always changed all 3 holes 3-4 K miles. What alot of folks do not know is clean fluids help maintain a seal better and will suspend more debris between changes I have never had leaky seals on any of my bikes

I've ridden H-D since 1969 and somewhere around 500,000 miles. Always changed all 3 holes at 5,000 miles (13 bikes). Never had engine, primary or trans. problem.

Guys, there have been many studies on this subject. I used to change my engine oil in all my vehicles @ 3 to 5K. Then I switched back in the late 90's. I started using AMSOIL and went to their extended drain intervals and began changing at roughly 20K miles. I sent off oil sample kits, and every time they came back as great. I dug even further into this. Most advanced oils are nothing like the old oils of the 50's to 80's. There was a study done where they proved people were throwing away perfectly good oil, oil that was still working great and doing what it's supposed to do. The oil companies didn't like this of course, because it was going to cut into their profits. I have a vehicle that I change the oil in every 20K miles and it is getting ready to hit 1/4 of a million miles and STILL runs great! I believe most people are still hung up on the old oil and believe it has to be changed at 5K miles. My wife's uncle had a 1970's Dodge truck that had well over half a million miles, he was a mechanic. He ALWAYS changed the filter and added a quart and that truck was still running fine when he passed away. Now I don advise anyone doing this, but I do believe the oil change intervals were done primarily for the oil companies to sell more oil! That's all I'm gonna say about this. Do what you feel is fine and do what the manufacturer says as long as the vehicle is under warranty. My bike, using AMSOIL in all 3 holes, does not get good oil thrown away because the manual says so, but my bike is an 05 Electra Glide and not under a warranty. I suggest doing a few oil samples from a reputable company and that will probably open your eyes a bit on the oil change scam.

I have a 2019 Triglide and I change every 5k miles. I use amsoil 3 hole motor oil, primary oil and Trans fluid. You guys are great and I've learned a lot from watching your vlogs ty

So glad you put this information out there for others. I made a comment in your "transmission oil change" video about your temp dipstick and started discussing oil change intervals and how parts materials haven't changed over the years. I know when I change my Primary oil for instance (change all 3 holes every 5K), I notice a significant difference in noise, smoothness, and ease of shifting. As you say, nothing has changed over the years except EPA requirements of companies. There are notable motor builders that can back this up too!

Change mine every 3-5 thousand miles. The same as my trucks and cars, been doing that way for 34 years an haven't had any problems or issues with any of my bikes or 4 wheeled vehicles. As you stated the cleaner the crap catching magnet is the better it works and always remember to check it to make sure it's still magnetized before reinstalling it. Sometimes they can lose it if they get to much trash on them for long periods of time. As the old saying goes, " if it ain't broke, don't try to fix it." Ya'll ride safe, have a Merry Christmas and keep the shiny side up and rubber side down.

I change my primary and engine oil every 5,000 miles or less usually (06 Sportster 1200) and my primary fluid comes out so clean looking with almost nothing on my plug. I use Amsoil primary and Amsoil 20w-50 respectively. I’m sticking to this schedule because of the results I’m seeing.

Interesting that when you take it to a dealer for an oil change, they don’t tell you if they do just the engine or if they do all three holes, but they still charge around $300 to $500 for a service regardless of your mileage. I just started changing my own oil and I think I will stick to all 3 holes every 5k miles.

TX can get miserably hot. As an everyday rider commuting 80-90 miles a day. I do all 3 holes @ 3k in the hot summer months and 5k on the spring & winter months.

Once a year or 5k whichever comes first. All three holes, all the time. Own an 02 FatBoy with only 40k but still changed all three, every fall, and have had no issues whatsoever. Had my tension shoes replaced at about 27k, and was planning on replacing the Oem cam with a new one since it was being done. Tech told me there was no wear at all on the cam and to keep doing what I was doing in regards to fluid changes. Originally used only Dino oil, since Syn3 was not out yet, but somewhere over the years I switched to syn3 or similar and never looked back. Frequency is the key. Cheap investment and a couple hours a year to keep it purring 😉👍

When I bought my 2018 Street Glide special I also bought the Dealer tire ins. (Well spent by the way) and the Dealer maintenance plan. That plan had oil change intervals at every 2500 miles plus free pick up and delivery up to 20,000 miles. I utilized everything in that plan. After the plan when I reached 20,000 miles I went to changes every 5000 miles. My bike now has 60,000 miles of smiles and I couldn’t be happier. One recall on the hydraulic clutch seal and one actuator replaced under warranty. One battery replacement. I use H-D Syn 3 as to what the Dealership does in the services.

I've got some years on me and my bike and taking care of what goes in and out is very important for longevity. My bike is an 04 and I'm 72+ and change 3 holes every 3-5000 miles. Hey it's my baby, let's ride!!!

You blokes must be psychic. I was just wondering about this last night. My 2018 Freewheeler is about to clock up 24000 km (15000 miles) so is due for the full service. Thanks gentlemen!

I change all 3 yearly regardless of Mike’s beings my trike sits all winter,one thing most people don’t think of is the possibility of moisture getting in your oil’s from cold to warm temps in humid claimants like we have here in Illinois,so to be on the safe side of things this is why I do mine yearly

Good stuff guys...I never thought about this. I may go back to 5K for all 3. By the way, I use Mobil1 V-twin full syn in all 3 holes.

I change mine every 3500 miles. Amsoil and redline shockproof with k and n oil filter. No problems.

I have an 03' softail 42mm mikuni standard softail. Bigger heads, pistons, cam from a 88 to a 103 running a 240 tire final drive. I have changed all 3 holes once a year with syn 3 cause I don't even drive my bike 5K a year. Due to covid bike fluids havn't been changed or started for 2+ years. Bike started easy with throttle primed, choke on with compression release valves started and runs great!

I use Amsoil in all 3 holes, and I clean my oil filter every 2500 since I have an Outlaw Oil filter and they can clog faster than synthetic filters. It's super easy to do so it's not biggie to pull it off, wash it, and put it back on.

On my 07' Fatboy I followed the owners manual on fluid changes. I have 46K+ miles on the bike now. I use AMSOIL synthetic V-TWIN engine oil 20W-50 in the engine, AMSOIL V-TWIN Synthetic Primary Fluid in the primary, & AMSOIL V-TWIN Synthetic Transmission Fluid in the transmission. I changed the engine oil @ 3K miles, primary @ 10K miles, & the transmission fluid @ 20K miles. After my last oil change (May 2022), I decided to change the primary fluid, & the transmission fluid @ 3K mile intervals, along with my engine oil change. Most of the time, I change the engine oil yearly, as I haven't been able to put many miles on my Fatboy in the last 3 years. I hope to get many more miles on my bike in 2023. I haven't rode since mid July of this year, due to health issues.

2008 FLSTC 105th Anniv Stage 1-every 5000 miles: SYN3 20W-50 engine, HD SYN 80W-140 Primary & Transmission-bike spent 5 years in Qatar (60° C in summer) before exporting to Cape Town South Africa-69K km’s on the clock and runs fantastic (maintained it myself from day 1)

Thanks guys, one of the best video's I've seen in a long time, not just on your channel; but in general as I'm a HD junkie. Boys you are correct, Canadian here and my manual says engine oil/filter every 8,000 kilometers, primary every 16,000 kilometers and tranny every 32,000 kilometers (negative the 1st service at 1,600 kilometers that change all 3 holes to keep warranty valid). I have a 2022 Street Glide Special I bought new, and do it at 4,000 kilometers (50% before their engine oil recommendation change kilometers/miles) plus the primary and tranny at the same time. It's not expensive and I love knowing I have fresh clean oil in all 3 holes.... all the time. Thanks for posting this, it's common sense really. I have to be honest I never thought of the HD carbon foot print issue to try to get customers to stretch out oil changes. I never understood my manual why such long miles between oil changes, now I know. A publicly traded company trying to lower carbon foot prints. Every day I learn. Always go with your gut feeling people. What an eye opener.

I am 82 years old, and ride a 99 EVO powered Softail Custom. Since I generally do not ride over 3 to 4,000 miles a year, I change oil with Castrol 20-50 non synthetic once a year, and change the primary and transmission with Harley transmission fluid every 2 years or so. I have 64,000 on it and it runs great, with no leaks anywhere. I always warm it up before riding as alloy cylinders need to expand to tighten the gaskets. I tried Mobil 1 synthetic once, and the base gaskets started weeping. Changed it back out to non synthetic. Stopped weeping in about 200 miles. I love my carbed EVO motor. It runs like a Shovel head with improvements. Plenty of power for an old guy to cruise the back roads around where I live. I started riding on a 1942 "45" flat head in 1955 when I was 14. Wish I still had it.

Well all I know is back in the day when I worked at a GM dealership the old diesel mechanic always said keeping the oil changed is the life of any engine! And I believe he’s right my old bike gets her oil changed in all 3 holes every fall before it’s put up for the winter which is only about 2500 to 3500 most times it maybe a waste of money but I think it’s good insurance and if I can get time to ride more I would still change it about the same mileage stay safe guys

One thing that I would like to point out, is that it never hurts to change your engine oil. One thing I've noticed while reading of these comments is, that no one ever said anything about changing it hot in suspension, ride it for an hour bring it in hot and drop it all out now. Oh yeah, one question I have is if it cost more to refine a gallon of gasoline than a quart of oil, how come a quart of motor oil costs more than a gallon of gasoline?

Was just having this conversation the other day. In my experience 10k is too long of an interval for the primary. At least in my bike it is. Primary gets kinda chattery. I’m going to 5k all three holes from now on. I use synthetics, but the early breakdown of any oil & its viscosity is a reality with air cooled or oil cooled engines and the heat they produce.

Really good info, guys, THANKS!

Damn good info👌 keep up the good videos 👍

Definitely makes sense! I was just telling my coworker that extended drain intervals are for emissions. Definitely gonna drain all 3 at 5k intervals

I worked in the oil business for 16 years. The only way to know what is happening to your oil is to have an analysis done. This will tell you what your viscosity is, whether you have metal or any other contamination of any kind. And it doesn't matter whst temperature you are running. The analysis will tell you if you are good or not. Make your adjustments accordingly. Don't ruin your ride, but don't throw your hard earned money in the waste oil burner.

I definitely change everything out prematurely out of wanting to tinker with something. 2-3 engine, 5 primary and 5 trans. I just get bored easy and like to use my lift…. It also depends on how hard I’m riding and or the area I’m riding.

I always change all 3 holes every 5 k. Always have always will. Thanks for the video. I thought most people were like me any way. I was surprised to hear otherwise

Glad you mentioned this. I do this now just like my old ram and Toyota where I originally got the concept. Zero issues and it’s a good practice.

💯 great explanation and view point I'm sick of corporate trickery

I'm new to all this, but I've already decided to change all three holes at 5000 miles for peace of mind and the one oil change that I have done, I used RedLine in all three. So my question for Mr. Kevin is, why use the Syn 3 in the primary instead of the RedLine? Thanks!

I live in South Florida, in Palm Beach County. It's hot here all year and my MC often rides in Memorial Day and Veterans Day parades. Keeping the bike as close to 230° F as I can. I have the Harley fan and a set of Love Jugs, but I always change my oil between 3000 and 4000 miles. I use Redline oil, Redline Primary fluid and Redline Transmission fluid w/ shockproof.

Living in S. Florida and riding less than 5k miles/year on my 2010 TriGlide, I change fluids once a year. Redline 20w60 (if I can find it) in the engine, Redline Shockproof in the tranny, and a mixture of Formula + and auto transmission fluid in the primary. At 33000 miles, trike still runs great!

Changing it more often can’t hurt! 👍

Good one guys!

Great video, Thanks for the info,

Thankyou for this video yes it was very helpful and useful information You answered all of my questions 🎉

Jmo, I change oil every 3k miles or less depending on how I’ve riding, I ride over 100mhp all the time so I change it often. Cheap insurance. I change the Transmission/primary fluid every other oil change. Just what I do based on how I’ve riding. You can only fry chicken in the same oil so many times. Facts! If I get the oil hotter than normal I change it asap

Wow makes sense unreal thanks!

Best bet is to follow Harley Davidson Owner Manual that came with the bike. Harley has a Research & Development Team who have tested these motors & transmissions. So they have a good idea how far the drive train can go before the next scheduled maintenance interval. Kevin even stated he has had no problems with the recommended maintenance intervals. If you follow the manufacturer maintenance schedule you should not have any problems. Can anomalies occur with your bike? Sure but those are in the minority. Thanks for posting and opening up some dialog on this subject matter.

Great info 👍 . Thanks for letting us know. I use H-D 360 20W50 in the engine and Formula+ in the primary & transmission on my M8 Road King. I do a 3 hole oil change and replace the engine oil filter before l put it in storage for winter. This is roughly after about a 5000KM riding season . I have 12,000KM on the odometer. So far so good.

Thanks for the info and would love to hear if your particles appear to be less after a few changes. I was talking to someone that worked in the oil industry and asked for his honest opinion on longevity of different brands of oil. He told me the in all honesty, all oils will protect for approximately 20,000 miles. I ask why then the frequency of recommended changes. He told me the reason is in the money. The more oil you change, the more profit that is made. It sounds like what I was assuming. That being said, I still change every 3-5 thousand miles. Now I’ll be doing all 3 every time due to your video. I have to tell you though, I have a 2003 heritage with 69,000 on it and have never changed the transmission or primary and it runs like the day I purchased it from the dealer. Call me stupid or just lucky, but that’s the truth.

I just changed the oil and filter a couple days ago at 5k on my FXLRS. The little magnet was almost completely clean and the oil wasn’t too dirty looking either (HD synth 3) was going to change my transmission at the same time but it looked perfectly clear and clean. I’m waiting on an aftermarket chain tensioner before I do my primary because I’m swapping out the factory one while I’m in there. I’ll go ahead and change the transmission too and look at that magnet. I suspect it will be in good condition judging by the appearance of the oil. If so, I’ll probably stay with 10k on my Tran and primary. Great information though. We can always count on you guys for straight answers.👍

Pretty good content, where in the world was I going to find a 2003 service manual. Thanks for putting it out.

I use AMSOIL and I change all three holes every 5000 miles. The cost involved isn’t that much more plus AMSOIL has primary and transmission individual oils. Redline and Syn3 are good oils too.

I don’t have the opportunity for 5,000 miles a year unfortunately. So I just change all 3 oils yearly. And with the engines running so hot, it just makes sense.

I change all three holes at 500, 1000 and every 2500 miles thereafter using Amsoil 75W140 in the trans, MCVQT 20W50 in the engine and Formula+ in the primary.

I do a 3 hole every time I change my oil, which is around 5k miles. Sure its more expensive but for me its worth the investment at the end of the day.

I use 20w50 in my primary, transmission and engine on my 93 FXRS-CONV. I change the engine oil and filter every 1,500 miles and change the primary and transmission every 5,000 miles. I do the same on my 2010 FLHTC using 20w50 Syntec. My reason is that oil is one of the main components of cooling along with lubrication. Plus I am keeping an eye on the engine internals. For those of you that ride an Electra Glide you know how hot these engines get. My EVO doesn't even come close to the heat coming from my FLHTC.

I put about three thousand miles a year on my bike and still change all three holes every fall. Thank you for the video and the info. I Ride a 2018 Road Glide Special just an fyi.

Thanks for the info. I change the engine oil every 5,000 Km with amsoil. Clean my outlaw filter every oil change. Try not to forget to clean my external breather catch can at the same time. Change the primary and trans every 10,000 Km with formula +

2012 Road Glide. I change engine oil between 3,000 and 3,500 miles and use Syn3 and a Harley oil filter. I change primary at the same time and use Formula +. Transmission is BelRay, also every oil change. The magnets are clean except for the normal fuzz on the primary. 3 quarts in the engine, a little over a quart in the primary, less than a quart in the transmission. Not a huge environmental impact since I recycle my oils. Just how I do it, I’m old and old school. Your mileage may vary.

I do mine and my wife’s bikes every 3-3,500 miles, Amsoil Engine, Amsoil Primary, Amsoil Transmission, Magnetics all look great, will keep do it as it works great for me.

I'm a seasonal rider in MI, I change min once a year which is about 3 - 5k miles, regardless once a year due to winter storage

In short: Change all 3 fluids every 5000 miles! For longevity. I have an 06 U.C., and have never had one drop of oil leak. Been using AMSOIL for years and changed fluids yesterday. Fluids still looked clean after 5,000 miles.(3rd change in a row with same results on oil)

Pushing a lubricant to an extreme age or distance only saves a little and costs a lot! A shorter oil change interval is one way of ensuring peace of mind and knowledge that there shouldn't be any issues. Of course the green weenies want long intervals to cut down on pollutants. Good Stuff, guys! Keep It Up! Oh, by the way...Stock! Bikes! Suck!

Good video guy's 👍

On 2013RK, engine = syn3 8000km (Europe), pri = formlua+ 10000k, trans = formula+ 12000 k, just for ease and less stress I am not doing 3 holes at the same time anymore, which I was doing with the Evo's (one time 11000 km on the 3 oils during a 4-5 week Scandinavian holiday in 2010, no problem with the oils on long distances in such a short time period ! ). On 2016UL, engine = syn3 8000k, pri = formlua+ 10000k, trans = gear oil 12000 k, this is the holiday machine now, if 8000 k is after holiday, I will do 9000 k, no fear, no problem, engine oil never becomes black (has no "tune"), no heavy consumption. On 2019UL CVO engine = syn3 8000k, pri = gear oil 12000k (starts smelling), trans = gear oil 16000 k, I think that's enough mileage, I won't go to 32000k / 20000 miles for the transmission, although that is the cleanest oil, with nothing on the magnetic plug. They will also extend the mileages for customer cost sake compared to the competition (at least for cars), after experience that the older shorter intervals showed no serious wear etc. , so were actually relatively too short. And, of course, synthetic oil is then prescribed as well.

Yeah I do the 3=hole oil change every 5k miles but use the the HD syn3. I figured if I’m on a road trip I can easily find an HD dealership and purchase the same oil if I needed to.

20/50 Full synthetic, on all 3 holes, engine 5K primary 5K, transmission 10K I will keep my schedule, when I babe changes the Trany at 5K the oil is super clean. Don’t know viscosity!

I change all three holes every 5000 miles, the transmission lubricant when I drain it at 5000 miles looks just like the new stuff I pour in afterwards. Engine oil always looks very good at 5000 miles (Harley syn3 in the engine, Harley synthetic in the trans & primary) I figure if you’re going to do the engine oil change, your right there, might just as well do the trans and primary.

I've been changing mine every 5000 since I bought it. Just for good insurance that all my fluids are fresh and working as designed.

Always Redline full synthetic 20w60 in engine, Redline shockproof in Tranny and Synth 3 in primary. Back in the days I used Castrol 20w50 and Castrol 80/90 in the gearbox on all of my Evo’s and Shovel’s, we filled the Primary with Castrol 20 or even 2 stroke oil could do the job since it always ran out over time. 😉👍🏻😂

I like that that makes sense. I know they were using sin three and all three holes I’ve never done that. Red line in the transmission Amsoil and Harley Primary the new stuff well, they changed a few years ago I guess. It’s about time.

good info... thanks : - )

I change my engine oil before I put it to bed every winter and the other two holes get done every second year. I use a full synthetic oil (AMSOIL) I use the specific oil type for each hole.

5k synthetic in engine and primary. Trans with Amsoil Severe Gear every 10k. I did change the trans at 5k once and the trans fluid still looked brand new.

I do all 3 at the same time around 3 to 4k. Amsoil in all 3 holes and I do the clutch adjustment. I tried redline in my transmission but I didn't like how it smelled. Ride safe!

Love this channel ❤yes I do a 3 hole oil change every 5000 miles

Hey guys, we have all been told to change oil every so many miles and that was due to oil companies. Oil doesn't break down the two concerns are the pH and contaminants. We still have guys that change their oil every ten thousand miles in the trucking industry but I know guys that have almost a million on an oil change. I don't see the advantage of changing the oil every 5 thousand for your 20 thousand intervals. If the oil is bad at that point you have bigger issues that wasn't caused by oil change intervals.

I believe the biggest deception with Harley Davidson and there oils is a lack of R.D. If you are using a after market brand you will be better off. My top brands in my own R.D. for my 2019 Roadglide will go to Torco full synthetic motor oil and gear lube, Mobil 1 full synthetic motor oil , Motul full synthetic motor oil and semi blend primary. Harley oils performed the worst of those 3 I have tested (Syn 3 & Harley primary and gear oil ) in my 2019 bike, for my 89 Evo Sportster engine H.D. 360 , Motul primary semi-blend, The primary runs quieter now than it ever has, since I stopped using the Harley primary oil in that bike. I also have heard Amsoil is a great brand to use as well . Thanks guys for doing this video.

I change all three every 3K, oil is cheap. Formula + in primary and trans and everything is smooth as silk. A Harley tech friend said most not all of his trans failures had Redline in them, don't know if there is any truth to it but that's what he see's.

I tried different brands over the yrs and found Bel Ray in all holes works the best. I have always changed the engine every 3-5k and all others at 10k, so every other engine fluid change.

I always change all 3 holes at the same time at every 5k. I use Amsoil for all 3 areas of my 2012 Heritage.

Clean fluids = happy mechanical. Simple as that. You want your pride and joy to stay strong and healthy, keep the oils/fluids fresh.

Manual transmissions are so durable no matter what the vehicle is. 20,000 miles after an initial 5,000 mile change when new is not going to harm any manual transmission. But throw your time and money away if you so do desire, no harm in that!

good stuff to know,I change my bikes oils all 3 places 1 time a year maybe 2-2500 on each.

I always did a 3 hole change between 4 and 5000 miles for the last 30+ years , I live in Arizona and the outside temperature is usually pretty toasty from May to October

I use Syn 3 in the engine and I use harley 80-140 heavy syn in the primary and trans, engine gets changes every 4 to 5 thousand miles and the primary and trans get it around 8 to 10 thousand so basicly the primary and trans get changed every second oil change and the oil gets changed every yr depending on mileage put on the bike as we have a fairly short riding season here in Canada. I only use Wix filters as well. Bike has 65 thousand on it and I run 2 up heavy, long haul touring and never had a problem at all, side note, the service tech at the dealership told me about the 80-140 weight as i was running syn 3 in the primary before and I was getting a lot of chain noise when hot from the primary and 5 gear howl because of the straight cut gears in the trans, the heavier oil makes it shift like butter and the 5 gear howl is gone.

I do a 3 hole oil change every 3000 miles. I use full synthetic by Amsoil oils. I do this because it’s easier to keep track of primary and transmission oil changes if I do them all at once. I like 3000 miles over 5000 miles because I like to keep the engine oil as clean as possible.

2014 LTD with 53,000 miles. Mobil 1 V-Twin in all three holes. Change all three every 3-4K miles.

Mobil 1 V-Twin Syn 20w50 once a year, all three holes, K/N 171C Oil Filter, and ride with confidence.

I change all three with Ams oil every 10,000 and have never had a problem. And I ride at least 25,000 miles a year or more.

Agreed. All changed at 5k. No worries about keeping track of primary and trans intervals.

I live in Arizona; yes, we ride in the Winter Months (40 to 60 Degrees), and a 5,000-mile oil change would make sense. BUT we ride in the summer months when it is 115+, SOOO it would make more sense to change your engine oil every 3,000 miles and a three-hole every other (6,000 miles). Yep, I'm a baby boomer. I turned a wrench for a living and have experience with motors in hot weather. Screw the ESG score (I’m a two Genders and EV suck kind of guy); I’m paying for my Bike and the upkeep of my bike. Maintaining CLEAN engine oil is critical, especially in a Warm or Hot environment.. PS: I also ride with the Patriot Gard, and our group participates in Parades (Slow speed with no Air Flow). We all know that heat can break down older oil. Poor oil conditions can do a poor job of lubricating the engine. Poor Oil leaves deposits (Varnishing) on internal engine components, plus clog passages with sludge, breaking down the Lubricating properties! Poor engine oil condition can reduce the lifespan of your motor and in the long run, can lead to more downtime and will be more expensive to operate your Bike. If you're not changing your oil regularly, I believe you are a Fool!

I do my engine every 3k, engine and primary at 6K, then all three at 9K, then start the routine again. Just sold a 2008 Fatboy with 61K miles and compression was still 126 psi

I use redline hole specific fluid in all 3 hole. And change all 3 every 5k. Little extra money but may save more money in the long run

You guys are GRT! Every 3500 miles / all 3 holes - use Bel Ray "Dino" Change the plugs every other time (7k miles - excessive "maybe" but for $12 it's cheap INSC) #MERICA

We do a three hole service every 5k miles on our police motors. We run them hard and they definitely get hot. The engine oil and primary fluid are definitely smoked by then. Heck, one training day will smoke the primary fluid with as hot as we get the fluid. We should probably service our fluids more often with as hot as we get them.

I use Redline also in all three holes between 4000 and 5000.

I’ve always changed all 3 and use synthetic in the motor and transmission but awhile back found that Lucas actually makes. Primary oil that isn’t synthetic. I switched from using Harley lubricants years ago. Not because I never liked the Harley products though. The main reason was because the closest dealership was 1.5 hrs away from where I lived at the time. It was a hassle to go there to pick it up. I’ve always used Lucas products around the farm on everything tractors trucks lawn mowers even my wife Mercedes suv. Right down to even my firearms. And never once have Ive never found a Lucas product that doesn’t do exactly as it’s advertised to do. Lucas products has never let me down. I’d make a good advertising agent for Lucas . I’ve even tried Amsoil products. We ran Amsoil in my sons dirt bikes and atv’s with great results. Very fine products just not a lot of dealers in our area. I’ve got a 2013 Ultra Limited. I really never liked the whining noise the primary’s make on them bikes. I guess it’s mainly because of the self adjusting tensioners they’ve got. I never felt that the transmission shifted as smooth as it should of. Hitting neutral when coming up to a red light was damn near impossible. And knowing my problem was in the primary and not the transmission after many years of owning these bikes When I switched the primary over to Lucas Primary lubricant I must admit I wasn’t impressed at all. In fact I was down right disappointed. The more I rode the bike though the less noise I was hearing. But still I wasn’t satisfied with the shifting. I had plans on giving the Amsoil another try but the only problem was the parts store never really carried the Lucas primary oil when I first purchased it . I agreed to take a whole case if the store manager ordered it for me. What can I do with about a whole case of that type oil. So when the bike came up for service again i decided to give the Lucas primary oil one more service period . When I pulled the plug on the primary I noticed 2 things 1 the oil wasn’t as dark as the other oils I had been running. But the other 2 oils was brown when I put th in new. And the Lucas is clear when it’s new. But the Lucas wasn’t even really dark at all the way clutch residue makes oil. And 2 there was hardly anything on the magnet. We’ll I’m coming up on the 5th oil change since switching to the Lucas and I can’t ask for better results . The whining noise is all but gone and I’ve got 0 problems with the way it shifts and my ability to hit neutral. I’m considering on only changing my primary oil every 6000 miles. I have no plans on doing the motor oil and transmission anything other than every 3000 mile though. I really see no sense in changing the primary oil every 3000 miles. As long as the oil continues to stays as clear as it has and I don’t begin to find metal shavings on the magnet. Sorry for such a long post . I do hope that it helps others. A lot of other guys in my area has switched over to using primary pacific products. As of now I’ve not heard any complaints about excessive clutch wear or anything else. Good Day to all

Spectro HD 20W50 every 5K for engine, SYN3 every 5K for primary, and Spectro 75W140 Platinum 6 Speed Transmission Oil every 10K for transmission. Since the trans doesn't get the contaminates like the engine and primary, it can go longer. Never see any metal on trans plug magnet (after the initial 1K change).

My thought is the primary and transmission oil doesn't see the temperatures and gas infusion that the engine oil does, so it should last longer. That being said, I just did my 5K service on a 2023 M8 and changed the primary too. I'll change the transmission at 10K.

I have a 2002 Heritage Classic. I never go over 5K on the engine or primary. Depending on how hard I ride the bike, I change the trans about every 8-10K. The trans is a closed system so it doesn't get near the contamination the engine does . The primary is a closed system also, however, the oil is contaminated by wear of the clutch pack. I know people that go 8-10K on their engine oil. I tell them if you're going to do that, I would change the oil filter at the halfway point. The best oil is useless once the filter stops filtering. There is a bypass valve in the oil filter. When the filter media gets plugged up, the bypass valve opens to allow oil to circulate through the engine. At that point you're bypassing the filter media and just pumping dirty oil through your engine. I use Amsoil 20-50 in the engine and primary. I use Amsoil 90-110 in the trans.

I do a 3 hole every other change. Engine i do at 3k. Florida heat is brutal so i do it more frequently.

Amazing video... great information.... what about if you ride 5000 miles in year and a half ? Would you change it on the one year mark? Or when you get to 1.5 years, or one years and seven, eight months? Thanks

Now to me it's common sense. I do 3 hole change, syn oil every 5000, 2015 ultra limited 103 ci. I do this because, " what's it going to hurt"!!!! Screw 10000, 20000 etc. And you have good oil in primary, transmission at all times.