Air-Oil Separator vs Oil Catch Can
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This is a discussion on Air-Oil Separator vs Oil Catch Can within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; What's the difference? Or are the two terms synonymous? Also, how important is it to install an AOS/OCC?...

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    Air-Oil Separator vs Oil Catch Can

    What's the difference? Or are the two terms synonymous? Also, how important is it to install an AOS/OCC?

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    MAINEiac 11blackSTi's Avatar
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    AOS are less maintenance but more expensive. I run a catch can, and is not needed to be emptied too often (typically you don't get a ton of blow by oil unless you are running very high HP set ups). It is an item I would recommend having, as it keeps oil blow by from getting into your intercooler, etc. This is a good write up (that is obviously trying to sell the AOS the Perrin developed), but explains AOS's and their function.

    Air Oil Separator for WRX/STI

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    Any opinions on which is better: Radium, Perrin, Crawford, or GrimmSpeed?

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    Registered User cflip2x's Avatar
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    What year is your car? also do you plan on going or already have a FMIC or stay with TMIC
    2012 WRB 4DR | SPT Exhaust | Short Throw | Rally Armour | WC Lathe Werks Custom TI Knob | Kartboy Bushings | Stoptech Brake Lines | JBK Elements DRL | STI HID Retrofit | XB LED Angel Eyes | GrimmSpeed Lightweight Crank Pulley

    CFLip2x 2012 WRB WRX

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    Master Baiter EJ257's Avatar
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    Crawford


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    2005 WRX STi (Mods | Virtual Dyno)

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    It's a '15 WRX. I'm curious as to if the new FA20 motor even needs it. It may not have the same oil blow-by issues as the EJ series.

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