Thread: Catch Can FAQ
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Old 05-11-2018, 12:09 PM   #327
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Join Date: Dec 2016
Chapter/Region: VIC
Location: Vancouver BC Canada
1998 JDM Impreza STi
V4 GF8 White


Originally Posted by KCRS01 View Post

when you use a closed loop system the oil just recirculates in the system, meaning, if it has dirt/contaminants it just go back to the engine.

while vent to atmosphere AOS vents the oil going to the pipe and going to the street. the dirty oil in the system is then completely removed and not recirculated.
Ummm.... there appears to be some sort of confusion here. Venting (or not venting) the PCV system to the atmosphere has nothing to do with where collected oil goes. These are two separate variables. The catch cans I use do not drain back into the crankcase, and it's a closed system... as Subaru originally intended it to be.
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Last edited by Vancouver98STi; 05-11-2018 at 03:22 PM.
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