This is for all of you who cannot understand an explanation but would rather focus on this so called REAL OCC LOL kzfaq.info/get/bejne/qLOqebCUrdilqYk.html

If you are destroying your engine with a oil catch can then none of you are doing your catch can correctly. The air slows down not cause of the line or anything like that. The air slows down cause of the large volume of the can and then is sucked right back out at the same speed. A water separator is not the same as a oil catch can. A oil catch can is having air pushed in one side and sucked out the other side. A water separator is only forcing air through. So again if your engine is damaged from a catch can, then you installed it wrong.

Great presentation! But I disagree with one minor detail. The OCC works great if used properly by not using the bronze filter. The filter is a micron filter and easily clogs with oil passing through thus restricting air flow. My remedy was to install steel wool with a down draft tube at the bottom. stainless steel scrubber flows alot more air while still maintaining the "catch" effect.

i actually tried this on my hilux diesel engine d4d, i had a provent occ installed, when i lifted the dipstick a lot of smoke was coming out and a little oil, when i remove the occ and put the stock hose back on there was no more smoke. i also tried it on my suzuki celerio gas with an occ the same with the one you use on the other video, it doesnt have a brass filter inside, there was no oil/smoke coming out as a lifted the dipstick during idle but when i ask someone to rev the engine oil begun to come out, i tried it without occ and oil did not come out anymore idle or rev. i think its true that the occ really hinders the flow of blowby out the engine. good thing i just had it installed less than a month, i will cut my losses and just put the stock hoses back on. thank you very much for an informative video.

Provent 200, they are designed for diesel engines, very low restriction, and they can return oil to the sump. Your example of the pneumatic air/water separator is naturally far more restrictive and it operates at times near 100 psi. The crankcase pressure/vacuum is general only a few psi or less.

Its all the explanation i needed to convice me just to clean the valves and the intake system rather than having a OCC. Thanks.

The primary and sole reason the oil catch can is there catch oil and debris from build up in the manifold. It is a preventative measure over the course of the engines life to keep the valves and combustion chamber cleaner. When installed correctly, they do not harm or cause any improper stress on the motor. They are designed to work efficiently with direct injected motors. The catch part of the catch can is there to catch oil droplets and oil droplets containing contaminants. You do not want oil vapor leaving the crank and getting into the manifold. This process helps keep the air clean and economy of the motor. When bought and installed correctly they have been proven through motor cycling tests to help reduce buildup and improve motor performance.

I've been using occ in my vehicle for 5 yrs, 100 k miles, till now engine runs smooth as silk

Two things, you have diesel engine and second the bronze filter is known to cause issues. I say on direct injection naturally aspirated engine the catch can is must.

Try it with an OCC that’s made for the vehicle, not one that’s made for High Pressure Air. If you use one that is set up for proper air flow and pressure, you won’t have any issues. If you get a cheap one that’s just using basic media, then it’s probably not going to work and do as you described above.

It is true for a diesel engine, but I find it very useful for a gasoline engine, especially one that works on direct injection of gasoline. I noticed after installing an oil catch that the black color disappeared in the exhaust, but before installing it, there was a permanent black color in the exhaust. I think installing an oil catch is important for the engine that works on direct injection for gasoline.

Good video, I expanded it. In the BMW N55, even more oil got into the system, pressure builds up in the engine and entrains additional oil. I even increased the line from the engine to the turbo a bit, but brought it back to the original length and lo and behold, everything is dry...I hope for a lower flow rate due to the thicker connection so that it can draw even less liquid from the engine...

Ohhh this made me convinced more. This is the explanation why it will just affect much engine life. Didnt read any comments explains why.. thanks much sir. Appreciated much.

Thank you for sharing your knowledge on this matter your explanation is perfect.

⚠⚠⚠⚠ Just a correction, the reason water builds up in an air compressor is not because of Humidity, but of Condensation. When air is compressed, it heats. Once is enters an expansion, or tank, it cools. The cooling process creates condensation. The air dryer does not impede air flow. Do not confuse air flow with air Volume. It has a desiccant filter that absorbs moisture. An oil Seperator is completely different. An Oil Catch Can (technically known as an oil Seperator) catches oil. Again, and air dryer ABSORBS, and oil Seperator or CATCHES. An air dryer is designed to operate with high PRESSURE, or VOLUME. An oil Seperator, only CATCHES oil. A Crankcase Breather is a different form of oil separator and allow engines to breath as freely as possible. Both look similar but the operate differently. Many high horsepower engines will use a crankcase breather to allow crankcase gases to escape quickly and efficiently. If you believe an oil catch can is affecting your car, try a crankcase breather. Crankcase breather however do not catch as much oil since they are primarily designed to allow maximum air flow. That said, oil catch cans do in fact work 100%. And their advantages FAR exceed any disadvantages. They DO need to be sized properly to your engine. Like I said earlier, do not confuse air flow with air volume. The cheap Amazon and eBay ones are too small and are mostly meant for smaller engines. They normally have tiny 1/4" inlet and outlets. A properly sized system may have as large as 12 AN, or 3/4" ports. WHERE you install a system is also critical. If you install the return BEFORE the throttle body, you won't have sufficient vacuum to pull air out of the can on a N/A application. Remember, vacuum is ALWAYS BEHIND the throttle body, so install the return AFTER the throttle body. If you have a boosted motor, install the return BEFORE the throttle body. If you are making boost, you are forcing air into the engine, thus forcing blowby. If you are forcing air into the crankcase, you essentially forcing unmetered air into the engine again and will cause the engine to run lean. Remember, lean is hot, rich is cool. Lean is mean, parts WILL break. A rich condition will simply drown and engine. Many OEMs use oil catch cans to reduce carbon build up in their engines, Chevy, Ford, BMW, Toyota, ect. I work on diesel engines for a living, working on class 7-8 trucks (18 wheelers). Diesel engines DO NOT create vacuum, or at least not in the way a gasoline motor with a throttle body does. That is why a diesel engine will have a VACUUM PUMP. Like I said earlier, you need an OIL SERERATOR. Diesel engines COMPRESS air, gasoline engines SUCK air. Therefore, you need an oil Seperator for the air VOLUME and pressurized blow-by your diesel engine produces. The trucks I work on use an oil Seperator to drain the oil back to oil pan while the clean air simply vents to atmosphere. Most aftermarket ones will have an oil separator that vents air to atmosphere with a little pod filter and a small container to drain the captured oil. The way you had your "air dryer" plumbed, will never work because it had no way to vent air to atmosphere. Again, oil separators, catch cans, and air dryers perform a similar task, but in completely different manners. Here is a good paper discussing how to properly size and build an oil Seperator system. For your application. speedtechperformance.com/wp-content/uploads/2020/01/Crankcase_Ventilation.pdf

Great info. It settled the decision for me and tied a couple things together. When oil is blowing up a dipstick, it is a likely clue that your PCV valve is becoming clogged. A dipstick that blows off its seat is a sign that there’s an extremely restricted flow like a stuck closed or near fully clogged PCV valve.

Sir.,ive got a diesel land cruiser prado with 1kd engine., my car was blowing oil coming out from dipstick. Is it be cause of excessive blowby?

Excellent presentation with theoretical and practical evidence. I’ll leave the catch can and delete the EGR instead on my Pajero. 👍🏻

I have a ram 2500 with a Cummins 6.7 engine. It has a crank case vent filter that filters the crank case exhaust. Doesn’t that slow the venting the same as a catch can ?

Thanks for the video. I had tried OCC and air separator on my diesel MB and GDI Hyundai. They both are different on air flow restrictions. The air separator shall not use on car engine. Blows gaskets! Using a quality with big flow OCC works for my diesel and GDI.

Great explanation, thank you so much. I bought a ssangyong musso 2006 turbo diesel 2.9L a year ago , the inlet manifold was found full of black paste. the engine ventilation from the rocker cover is connected to after air filter and before the turbo. what do I need to do to prevent the build up of carbon and oil at the inlet manifold again please? thanks in advance

Very interesting. Great demonstration to prove the point. At a surface level, one would think the air intake would be enough and it should be able to vent without a return, but your video shows exactly what you are saying.

buen video m interesa tu informacion me motor es nuevo entonces no es recomendable el recuperador de aceite verdad ?

Hi! Great educational video. But how about if we bypass the breather hose (free outflow)? Is there any effect to the engine? Reason people do this is, for turbo engine it will re-route to intercooler thru turbo compressor. Later it will make it clog with oil. Thanks.

good day sir, how about suv with turbos? like my case, an isuzu 4jg2 with excessive blowby from the breather. it always carry oil, does an occ help to lessen it? will it be more beneficial?

how about occ during harsh winters? i live in canada and i mostly park outside the driveway. ive read and seen videos where occ freezes and the pressure goes to the dipstick causing oil splashes.

There are versions of the same oil catch can you had on the paper, without that bronze filter. Air restriction is not required to collect the vapours and make them droplets. It just needs baffles. Use stainless steel sponges or so. They deflect the vapours, cool them and also let the crankcase breathe as easy as it needs. I ask for your opinion too on my theory

Thanks for that information. I had an occ, but experienced a flat spot in acceleration. It recently unwound the pot due to vibration and I lost it on the highway. To prevent oil spitting on my exhaust and unfiltered air being sucked into my intake, I bypassed what was left of the occ. The flat spot is gone and my engine feels more responsive. After seeing this video, I’m not replacing the occ! Thanks heaps 😄👍🏼

I almost have OCC installed on my Montero but neglected having bought one after viewing your video. thanks

Big agree Sir, palaging nanood about tutorials mo sir. GODBLESS

What about ones like racing lines catch can for a golf 7r with just a baffle plate but no filter media restriction like your seeing in that typical oil catch can. Would you not get the best of both worlds then?

@Mr.DIYer - I cant udnerstand your video you say dont install oil catch can ??? the blowbye gas and oil goes to the manifold is this better it damages all components,injektor etc... I have a Mercedes c270 cdi 2001 and I have this Problem too much oil in my intake tract - my Turbo is new manifold is new the crankcase ventilation is new ???

Thank you so much for the explanation. No occ for my truck.👍

I have a occ breather tank it doesnt have a bronze filter will it still do this high pressure thing

Absolutely amazing explanation! Now I need to evaluate do I want to install a OCC‼

Wow! Thank you for this video!

Very interesting!!!! My unmodified petrol engine is pushing out the oilstick. This video helped me understand the phenomenon

You forgot to mention that on a diesel there is no vacuum in the intake. I have not seen any butterfly flaps on that intake system. And most diesels have no PCV valve. they just have a tube out of the headcover. It's always at atmospheric pressure so the catch can setup needs to be changed. The OCC setup with baffles and the filter inside is used on most gas cars that have Vacuum in the intake and it works great there cause it's being drawn out. Most diesel engines have no vacuum in the intake and use the OCC setup with baffels, ehich then is usually vented to open atmosphere through an outside open filter or intake without internal filter cause it is being pushed out with a positive pressure in the crank case. For a diesel we usually use a bigger catch can or larger diameter path ways so the air slows down but the volume is the same

Wow, you have completely rocked my world. I’m so confused what to do!

in your opinion, the provent 200 model can give the same problem?

I had Provent 200 installed on my 2016 Everest 3.2L on year 2018, never had problem ever since. But, recently I have encountered the strange loud humming sound during low speed acceleration, sounds like a modified exhaust pipe blowing, or the subwoofer playing the 40Hz tone, the whole cabin can feel the vibration. The issue was intermittent, my initial thought was the EGR system, dirty or EGR value malfunction... Ran the Forscan, no any code found and everything was fine. So I went to clean the EGR, Intake Manifold, Throttle, thanks to the OCC, the EGR system had little carbon, but it was dry. After assemble the everything back, I expect the loud humming sound would be gone, unfortunately, the noise was still there. I suddenly recall that I had OCC installed and I might as well to check if the oil can is full, or the filter is blocking the blowby gas, becoz the filter is almost 5 years old. The next day, I removed the OCC filter and decided to give it a try, Vola~ the engine humming sound was gone, everything sounded normal again. This video explanation make sense, OCC can alter engine performance, or do damage to the engine, especially with those cheaper OCC. For me, I will just bypass OCC for now, since the new filter is too expensive, I would rather clean EGR system once a year.

Thank you for the video. I have one question. It is about the breather port on the valve cover that is directed into the air intake hose. I have seen some car owners modify it by installing a small air filter on the breather port and it stops there, not connected to the air intake hose in this case. What do you think about this?

This is why you don't run a cheap catch can with one of those silly bronze filter things. Proper catch cans use baffles, or centrifugal force, to force oil droplets to collect on surfaces inside the catch can without impeding the airflow that much. Also, that engine has a lot of blowby...

Well explained and shown!!!!

Hello brother can you tell me why I see white smoke coming from oil cap in the morning and the engine is cold in first start and that white smoke same when the engine is hot

What an Interesting video. I'm assuming that the car you used in your illustration is a diesel. What interested .e was when you attached that one way valve and got blow out through the dip stick tube. A faulty/blocked PCV can also cause blow out through the dip stick tube. I know this through person experience. However what about a V6 petrol vehicle like the Lexus is250? What is your view about fitting an OCC to one of these cars?

Makes sense I’m just going to purchase one without the bronze filter and mount it cose to the intake. Thanks for the video

Does it work in 4ja1 diesel engine?

Hi, If my OCC get filled up all the way to the top and it never get empty, even freezes up on winter. can this cause damage to the engine. I am just trying to see if this is what cause my timing to jump on my Jeep Grand Cherokee. please I would appreciate your answer..

But would the OCC have the same negative effect on a gasoline engine instead of a diesel like yours?

Very informative explanation. Tyvm sir.

Great explanation and presentation!

Thank you for this awesome video because after watching I'm not going to fit a OCC in my engine.

Salamat po sa napaka gandang paliwanag.👍

Please 🙏 give me a solution to stop the oil coming in my air intake with out catch can

Most your videos are good... but this one is a bad example/comparison. An air compressor water/air separator by design has and small orifice and a lot of restriction, counting on the fact it is fed high pressure compressed air. The compressed air is pushed through an orifice to increase the velocity of the air and create a vortex in the bowl of the separator. The sudden expansion of the air exiting the orifice cools the air causes moisture to condense, and then the vortex (like a Dyson vacuum) is used to spin the water out of the air which then impacts the walls of the bowl and dribbles down to the bottom. This is not how a catch can works. A proper catch can designed for a diesel engine DOES NOT have a designed restriction of any kind, it does not rely on accelerating the velocity of the gasses and creating a vortex to "spin out" the oil. This is not done for the very reason that it creates a large restriction to the flow. A proper catch can has large inlet and outlet, at least the same size as the original hose. The gasses pass through the can with no appreciable restriction using baffles and/or media such as steel wool or large pore sponge who's sole purpose to extract heat from the gasses and provide a surface to condense out the oil without causing flow restrictions. Since the velocity of the gases is fairly low to begin with, the condensed oil simply drips to the bottom of the can. If you can measure a pressure drop through the catch can, then it is a bad design or too small for the application. (Yes, if you have high end lab quality manometers, you can measure a slight pressure drop, sensitive lab equipment will show a pressure drop in straight hose too..) A catch can with bronze sinter filter should never be used on a diesel engine and is a bad design made by marketers that don't care/understand engineering. Why don't manufacturer's include them? Simple cost and maintenance. For the average owner, the engine system as designed will greatly out last the time they will own the vehicle and through the warranty period and it is one less item to be maintained, and one less item to pay for during manufacturing. Why do I run one? I have a diesel truck that gets used for towing quite a bit, one down side to the factory design without the catch can, over time oil collects in the intercooler reducing it's effectiveness. On a turbo diesel, the crankcase fumes are introduced before the turbo, the oily fumes are then sucked through the turbo, compressed, and then cooled in the intercooler, where the oil will condense out, just like in a catch can. The average owner would never notice this as they don't work their engine hard very often and more importantly, don't keep their trucks for 20+ years and hundreds of thousands of miles.

Nice brother! I am gonna be running both but it’s a Sbc 2 valve covers etc… A vacuum pump is even better 👍🏻👍🏻👍🏻

what in information.... DIY ASAP, back to stock. Thank you for that great information

Yes this is possibly true, i have tried the same and there i have found that there are engine oil leaks coming from the lower crankcase as well as blowby gases coming out from the oil dipstick when i installed OCC in my 4JJ1 Diesel Engine turbo

Good day Sir. As always, thank you for the very informative video. May I ask Sir, what will happen if the occ has big enough cavities that will not hinder the flow of blow by gases?

I have tried a mishimoto occ on two of my gasoline engined cars and Ive noticed that when i rev my cars hard , the catch can does catch a lot of oil but it also causes a leak at my oil filter gasket. I figured that the blow by gases arent venting out as efficiently and its pressurizing the crankcase . Thanks for the eye opener , shall un- install the catch cans from my cars

Haha I knew I wasn’t crazy !! I have too one of these replica mishimoto oil catch cans that contain the broNze filter which didn’t take long to clog. I started to notice a lot of leaking around my can and also leaking around my valve cover and Vanos gasket. Glad I noticed it quickly and remove the bronze filter and now the oil leaking around my valve cover has stopped. I’m considering just venting to atmosphere using a differnt can

Very informative 👍👍👍

Never had a problem I run one on my silverado for 2 years now. I took the intake off cleaned it and also cleaned the valves that was disgusting. Installed a 30$ can took it apart few weeks ago and it was pretty clean still. I never let the can over fill and I clean the brass filter with carb cleaned every oil change.

Thank you for this information.

What if I used one of the OCCs with the removable bronze filter and removed that then placed steel wool in the can under that plate with holes. That should allow the air to flow through at a good rate but still give area for the oils to collect on right?

Thank you so much!

Thank you very much

A proper occ shouldn’t cause any restriction in air flow. Mine certainly doesn’t.

Omg this is beautiful instructions thank you

A very logical explanation, OCC will increase the workload on the piston and crank components...

What a good video! When I saw the thumbnail I did not expect that, but the content quality is much higher than the visual quality.

Thanks COOP ...

What about for turbo diesel engines?

In any improvement you do there are always tradeoffs. Increase oil crank pressure is the negative of OCC, but it can be negated by keeping the screen clean and draining everytime you do an oil change. Toyota has managed very well with oil seperators that not just take out the oil but then have the extra pressure of putting it back into the pressured crank. Drag and circle track racers often use vacuum pumps on chevy v8's to reduce oil crank pressure, because they can gain a few more horsepower with negative pressure. The benefits to not putting the oil vapor gunk back into the engine through the intake are huge and are more than carbon buildup on the back of the valves (which is really bad in its self). Other benefits are increase octane, cleaner engine all through the intake, valve body, longer life of the catalytic converter, etc.

Very clear SIR..

Good presentation.. like what he said it’s up to u to decide.. To see is to believe 👍🇨🇦

Thank you for sharing Sir

than you sir for good explane

How about just venting pvc to atmosphere and plugging the hole to the intake. Would it damage the engine? I font care if its illegal just dont want to damage engine

I’ve been a gearhead for 60-years and I’ve never heard the abbreviation OCC. AnyWho, good video, so thanks for posting .

keep doing helpful videos sir, keep it up God bless

Thank you for that video! Very well explained :) Had to experience this issue first hand. Oil spilled out my engine under boost pressure, now I know why. Gonna throw out my OCC immediatly

Hi, I love your videos and I'm certainly learning a lot. Can you also share your thoughts regarding Diesel Pre-Filter Kit? Thanks a lot! Looking forward to more of your videos!

I’m dealing with a 2.4 eco tech where the PCV system is fed by a tiny metering hole in the intake which clogs constantly since it’s directly below the throttle body which is directly below the port on the airbox, so crud drips down almost in a straight line from the PCV exhaust right into the PCV intake port….. so you sort of have to choose the cause of your blow by, extra tubes and filters or clogged PCV intake.

How about if we will remove the filter of the occ sir

Great explanation sir, naintindihan ko tlga kahit d ako automotive expert hehehe.

I'm thinking about buying a Catch Can for my Camaro ZL1. I'm going with Mighty Mouse since they have what they call a mesh which I'm assuming is the same thing as steel wool. I hear elite engineering is also a great Can but a lot camaro owners seem to go more with Mighty Mouse. Let me know what you guys think about it.

Wowowowowo. You are really great

thank you

Wrong, an oil catch can does not slow the air coming out of the crank case. Rather, a proper OCC has more volume than the hose upon exiting the engine thus, as the air passes thru the can it is slowed enough for the metal element to catch/condense the oil and allows it to drop to the bottom of the can. As the air exits the can it will be at the same pressure it would have left the engine crank case at. Your experiment using a water/air separator from an air compressor is a joke. That water/air separator has a small orifice that will not allow the gases to pass freely. Air compressors operate at 100 PSI or more. Your crank case is maybe 1 to 4 PSI thus when you stopped the flow of gasses with the compressor air/water separator you had oil coming out of the dipstick. You should have used a proper catch can in you experiment. I have and they work although you really only need them on direct injections engines since port injection allows the fuel to continuously clean the intake valves.

Huli ko na to na panood. Masyado rin akong nag paniwala sa iba, na dala rin ako don sa oil na nacocollect kala ko i kakabuti sa makina, nung ni install ko last year occ ko walang talsik sa dipstick nung wala pa occ, ngayon meron na kahit, kahit binalik ko na sa dating hose may talsik na.

Very good explanation

Thanks. Interesting. However the dipstick pipe is underneath the oil level. So it does not affect the spray out. But with to much restriction or orfice as your air dryer, it restrict to much the blow buy on the dipstick pipe. 😊

where do u live? i saw the amaron battery and thought India but then the accent and vehicle models do not match up ..

Well Explained!!! Magic Phrase… As Soon As Possible!!!

Have you checked PCV valve ? If it is clogged or not

you are correct in your case as the flow is slowed a lot via your line having a small drier. if you have a larger air drier you have more surface area you will haved much much much more flow. same applies to OCC. and ditch the bronze filter. OCC cans, not necessary. Id suggest a can style occ that uses swirl and not filter. Very little to no loss of flow and velocity. A high output direct injection turbo engine really needs a OCC to evacuate blow by and crank case vapors as to prolong valve cleanliness. My experience in high output performance. They work as intended with no rising crank case pressure or loss of flow as ive installed and tested, they did not have bronze filtration as well.

My catch can came with a tiny cone shaped air filter that can be placed on top. Im guessing this is intended for a vent to air system? So i could simply plug the pcv hole on the intake and just let it vent to air through the cone shaped filter 🤔

My OCC doesn’t have any Baffles or Filters inside of it. It’s basically just a Catch can made out of a heat resistant metal. Everytime I empty it has dark black oil in it. But I’ve seen other videos where they pull out a lighter brown looking liquid. Do u know why?