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I think they are really hit and miss on ones that use oil vs ones that don't. Clean the catch can, change your oil then check it in 1000 miles. See how much is in there. I had a catch can on mine but I took it off. 3oz of oil in 3-4k miles didn't seem like it was worth it to me. If I raced the car regularly maybe I would care more.

Wait until the car goes into limp mode in the fast lane of the freeway during rush hour because one of those catch can hoses has a pin hole leak in it. I'd rather burn some oil...

DAHIK

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Ditto That!