Nobody puts a CC on the passenger side. Like mentioned, it’s the clean side and air gets drawn in. There can be a small amount of oil vapor than can get in there under WOT especially if you have a blower or turbo but the solution is a Clean Side Separator which collects that and then as soon as the throttle is released it immediately drains back into the head. It replaces the oil fill cap. I have this one on my blown 02.After reading most (less then half ) of this thread, I noticed one of the recommended CCs was the JLT, the discription says it's for the driver side. What's the difference between driver and passenger CC and wouldn't you want to first put one on the passenger side?
Clean-Side Oil Separator
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