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  1. #1
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    Oil catch can performance question???

    How much cleaner will your valves stay with an OCC? Has anyone with an OCC cleaned their valves yet and taken photos? I haven't seen anyone mention it.

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    An OCC will not prevent all oil from getting into your intake valves. Basically it will delay the inevitable
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    Click here to enlarge Originally Posted by marv85 Click here to enlarge
    An OCC will not prevent all oil from getting into your intake valves. Basically it will delay the inevitable
    Even if you empty it and whatnot? How much does it clean things up?

    I saw picks of just how much oil was in it posted in sort of a timelapse and it sure looked like it was doing a hell of a job.
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    Delays, you'll still have oil pass through the OEM PCV valve which will lead to clogged valves. I have a BMS OCC installed now, it'll stay on until I get my intake valves cleaned, at which time I'll install the RB PCV upgrade. After 10k of hard driven miles, I'll see if the OCC is effective or if the PCV upgrade is doing the job (check the can for oil levels, the CP to see if there's oil residue, etc).
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    What is the RB PVC upgrade and what is it supposed to do?
    I have never heard of it but if it slows or stops the valve carbon build up I am all for it...

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    Higher quality PCV valve that reduces oil blow through compared to the OEM PCV. I don't remember Rob ever publicizing it on this forum, but here's the thread over on N54 Tech

    http://www.n54tech.com/forums/showthread.php?t=15382

    You can page through it, look at pictures of the actual piece & read some 1st hand reviews in the thread. Unfortunately I haven't found the time to install mine so it's sitting in the trunk in the same envelop it was shipped in & now I think I'll just wait until I get the intake valves cleaned @ 50k (~8k away). I'm pretty sure that @dzenno@ProTUNING Freaks has it installed on his car
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    Thanks I will go check that out. I have 54K miles on mine and I should borescope my valves to see how bad they are.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Even if you empty it and whatnot? How much does it clean things up?

    I saw picks of just how much oil was in it posted in sort of a timelapse and it sure looked like it was doing a hell of a job.
    Some cars need it more than others. Bigtom for instance sees a lot of blow by and his can gets full pretty quick. My OCC didn't catch anything in 10 months (barely coated...).

    With that said, it helps some more than others but it's not a 100% efficient system, some oil will always go through and hence the delay of the inevitable.

    (sorry for the late reply)
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    I have no occ and I have 54k miles, car idles smooth as he'll and runs great. I plan to get my valves cleaned in the winter time....I'll be anxious to see how dirty they are. IMO the OCC isn't really needed.
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    I'm hoping someone with the upgraded pcv will chime in. I didn't know such an option was out there.

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    I cleaned my valves about 15k miles ago, and just checked again last weekend. I had wet oil residue from all 6 PCV ports in the intake ports. I cleaned them again, and I'm upgrading to the RB PCV valve. I also think that @themyst recommendation to check/replace the VC gasket is right on, as well, since the PCV oil separators are inside the VC, and a faulty gasket seal can cause individual ports to leak vacuum/boost and cause it to draw excessive oil/crankcase vapors. At least that's what I'm suspecting. Rob Beck has done a lot of investigation on the PCV system of the N54, as has Dzenno.

    The other thing to check is to replace the pipe that runs from the back of the VC PCV port to the rear turbo inlet pipe. After one year, my rear turbo compressor outlet has a trace of oil and dirt on it again. That PCV pipe should have a suction limiting valve that may be gunked up slightly, also allowing excessive crankcase vapors to be pulled into the rear turbo compressor.

    An OCC only addresses one part of the PCV system. I would agree with @bobS that you probably don't need an OCC, just a properly functioning PCV system and a clean engine.
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    Click here to enlarge Originally Posted by zeenon53 Click here to enlarge
    I'm hoping someone with the upgraded pcv will chime in. I didn't know such an option was out there.
    +1, Didn't know about it. I have my bms occ installed. When i checked it after 3-3.5 months , there was a teeny bit of oil at the bottom and there was an oily residue on the intlet side of the can. The outlet side was bone dry.

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    Click here to enlarge Originally Posted by marv85 Click here to enlarge
    Some cars need it more than others. Bigtom for instance sees a lot of blow by and his can gets full pretty quick. My OCC didn't catch anything in 10 months (barely coated...).
    What accounts for the large difference between you and him?
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    Click here to enlarge Originally Posted by Stucks Click here to enlarge
    +1, Didn't know about it. I have my bms occ installed. When i checked it after 3-3.5 months , there was a teeny bit of oil at the bottom and there was an oily residue on the intlet side of the can. The outlet side was bone dry.
    That means it's working.

    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    What accounts for the large difference between you and him?
    How aggressively you drive the car & how the PCV is holding up on each car. It's a cheap plastic part that doesn't guarantee it'll hold up, kinda like the OEM DVs + CP. Some cars they hold up, other cars they break the minute you add a tune Click here to enlarge
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    @JamesM3M5, curious what your expereinces with the RB PCV will be. I've had my RB PCV valve in for 5k km, and I now have oil consumption.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    What accounts for the large difference between you and him?
    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
    How aggressively you drive the car & how the PCV is holding up on each car. It's a cheap plastic part that doesn't guarantee it'll hold up, kinda like the OEM DVs + CP. Some cars they hold up, other cars they break the minute you add a tune Click here to enlarge
    +1
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

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  17. #17
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    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
    That means it's working.
    Yup, my point exactly.

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