The ingestion of PVC oil creates deposits (pockets of oil) inside the air intake system and also creates valve coking on the intake valves. Is a Catch Can
absolutely necessary? No, but take a look at this:
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2015 SG, 2LT/Z51, Adrenaline Red, M7, MRC, red calipers.
My comments are just my opinion. Please don't take them personally. Thanks!