I want to thank you for this video and product selections. I just did this project yesterday using the suggested pump. Easy peasy!! Thanks again. Your videos are very very helpful.

Great. Now I have “clean differential cover “ envy!!!!

The 1.9s always had the open diff. Only the inline 6’s have the Torsen to limited slip.

Great video as always! I watch them all. I did a video on this a month ago and I also tried the Valvoline bags. I will agree it takes longer than a pump but I like the easier cleanup without having to deal with cleaning the pump hose so it isn't dripping on everything. I would argue the cost of a replacement cheap pump to toss is close to the extra convenience charge of the bag. Both options work and I love that the oil companies are slowly giving us more options.

Using a jack to break the bolts loose! First time I’ve seen anyone do this! Brilliant!

Great video Mark! Thanks for the explanation of the different oil specs for the various differentials used in our Z3s. I can confirm that using the 75w90 oil in a 2000 non-M results in a whine when the oil is cold. Also, reusing crush washers, even if you sand them flat is risky. I had to replace ATF fluid an extra time because the crush washer sent with my service kit was the wrong size, so I sanded and reused the original. Leaked from the start. Also, to get more old oil out, lift the front or back opposite the drain plug higher, then level or lift the plug side higher to get more oil in. I believe level is fine, as the gears are bathed in oil during rotation. Too much oil may result in axle seal leaks.

Thank you for the great videos you offer for the enthusiasts of the most beautiful roadster in the world ❤

First off; brilliant videos. I got my Z3, 3.0i a few months back and because there was very little service history I decided that it'd be best to check all the various wear points the Z's are known for and start from scratch. The M54 is a sweet engine but I'm discovering that here are quite a few areas to check out to maintain performance and reliability, but she pulls like a train. To my point. I changed both transmission and diff oils yesterday and what a difference it has made to smooth out gear changes. I opted for Red Line 75-110 for the diff and MT 90 for the gearbox. The oil plugs on both units were a pig to shift and had it nt been for you novel idea of using a wrench and trolley jack I'd have been there still trying to budge 'em - I guessed they were a tad tight when the rear end started to lift before finally looseneng! , I appreciate your enthusiasm and attention to detail. Bon chance from the S.W. of France.

I believe proper fill is usually get the car flat and fill until it drops out, then don't place the fill plug until it finishes dripping. Im not certain on the z3 diff process I'll have to look up to confirm lol I watch a lot of m539 restorations and thats his process on other old BMWs. I believe he follows proper shop manuals. Another great video mark! Everyone should get all their fluids on these old cars up to date. It's only right!

Brilliant! Defo something I'd like to do in the future

I'm also from New Brunswick Canada, I just bought a 1999 Z3 2.3 manual 2 weeks ago, compared to my 1999 Miata I sold this car is awesome

Hello Mark, as always, it was again great fun to watch your informative and well done video with perfect explanations. One thing left to say: Never reuse crush washers. Saving a few cents at one point can cost you a lot in case of a failure of a used one. Greetings from Germany!

Thanks for the tutorial! Just changed mine with the 75W-140 Valvoline using the Slippery Pete pump. I took my time, but easy process. Wound up using about 1.4QTs for my 2000 2.3 manual. Used the 45 ft-lbs torque. Suggestions on cleanup for the pump to reuse for transmission fluid later? Just pump soapy water through it?

perfect lunchtime video, thanks 👋

Glad to see my car on zed of the week 🙌🏻 Luis here

I did mine as soon as I bought it with 85,000 miles... no idea of the history, so I baselined mine. It's a 97 1.9L open diff, and I used 75w90 Royal Purple with a pump... about a qt. The oil that came out looked really clean just like yours, but what the heck! Just get it done so I know it's done.

Hi Mark great to see your content..we have a 99 Z3 with the 2l 6 and we love it..keep up the fantastic vids kind regards...William

8:00 you can use a lowpro jack in place of the extra energy it takes to muscle off a too tight bolt

Would be nice to see a video on replacing the rear plastic window with a glass one of you haven’t done it already 👍🏼

brilliant!

Now that 1 year has passed, are you good with the choice of fluid and how you filled (by lowering the front to allow slightly more than 1 qt)? Any new tips to provide? I am about to do mine 1998 Z3 2.8 Thank you.

Put in Amsoil 75W 140 on my 2001 3.0 and it's been shifting great 30K later. No one carries 75W 110 around me.

Took me a moment that the spare tire well has to be removed. What does this involve?

Actually too much is worse than too little. Can great more internal pressure and possibly force a seal leak. Slightly less is safer. Its a splash lubricating system

Just curious, did you measure the amount of gear oil that you removed from the rear end? I was brought up that in some cases overfilling can cause more harm than good. Whoever did the last gear oil change got a little too excited with the task at hand... Like the old school torque wrench: Have you done a gauge variation check with a calibrated torque wrench? Nothing wrong with old school as long as the readings are accurate...

Glad i watched this beforehand as i picked up some 75w90 but i have a 00' 2.8 LSD M varient. 140 IT IS

How can I tell for sure if my 2001 3.0L Z3 rear diff is LTD or not?