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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Oil catch can



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      02-12-2014, 09:12 PM   #1
GregDiNuzzo
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Oil catch can

Is it necessary? I'm going to be running around 18 to 20psi
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      02-12-2014, 09:19 PM   #2
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I've read they don't do much for our vehicles... and just to give your manifold a clean as well as walnut blasting the intake ports on your heads. Something to do with heat causing oil vapors... bypassing the catch can for the most part. But don't quote me on that.
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      02-12-2014, 09:24 PM   #3
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if ur boosting tht much.. its alwase better to b safe than sorry..
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      02-12-2014, 09:24 PM   #4
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It's useful for sure. Otherwise it's going right into the rear inlet

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      02-12-2014, 09:27 PM   #5
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I think they are useful

here's what mine caught after 10,000K (6213 Miles) - 2 engine oil changes as well


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      02-12-2014, 09:28 PM   #6
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For $100 I probably should get one and play it safe
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      02-13-2014, 12:42 AM   #7
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An Oil Catch Can was never designed for preventing oil/carbon build up on the intake valves. What it was designed for, and will successfully do, is catch the free floating oil vapor that usually gets caught in an FMIC, Intake Piping, Charge Pipe, DVs/BOV, etc. Obviously it's impossible to catch 100% of the oil vapor, but this will definitely catch a significant amount of the vapors.

Oil blow through occurs on every N54 from some degree, even completely stock cars. Anyone who's seen an FMIC be installed can confirm this just by looking in the end tanks or stock couplers, chances are there is some oil residue.
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      02-13-2014, 01:20 AM   #8
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Definitely recommended on this platform.
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      02-14-2014, 06:09 AM   #9
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I just put one on. It reduced the amount of blow back
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      02-14-2014, 07:00 AM   #10
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Can't hurt. Could help.

Get the proper multi-stage style, like BMS's.


Pair it up with a sturdier PCV valve body from Rob Beck (RB) and you've got a good (if not complete) blowby insurance plan.
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      02-14-2014, 11:50 AM   #11
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I wouldn't say they do "nothing".





After 3000 miles.

It reduces oil blow by into the intercooler charge pipe and intake the intake manifold.

If your concern is preventing carbon build up on the intake valves you will be disappointed find out that is inevitable as it is a characteristic of direct injection engines since the injectors do not pass fuel over the intake valves any longer.

However the OCC still helps in keeping oil out of the intake tract in general.
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      02-15-2014, 05:26 PM   #12
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Bms Occ -- Oil Recomendation

Definitely think heavy mod N54 would benefit from:

* RB TURBO PCV Valve
* NEW BMW CRANKCASE FLAPPER TUBE

AND

*GRP 5 OIL LIKE REDLINE / MOTUL/ AMSOIL which I think work perfectly with an OCC in supporting reduced valve intake deposits due to low NOACK + improved ring seal + temp control

High Flash point + Impv Piston Ring Seal + lwr temps & Functioning Flapper + BMS OCC + RB TURBO PCV = HEALTHY / CLEANER VALVES.

Once the valves are walnut blasted -- the car runs GREAT and we all want to keep it that way.
.
Its not just 1 fix (OCC) it is the combination of several that supports a clean engine.
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      02-15-2014, 07:05 PM   #13
enrita
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      02-15-2014, 11:09 PM   #14
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i personally think its useless. walnut blasting is getting cheap, only 350 at some places. might as well do that every 50k miles and ensure no carbon buildup for sure.

most BMW mechanics laugh whenever i ask about OCC lol
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      02-15-2014, 11:10 PM   #15
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of course our vendors would agree with OCCs lol
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