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Use this valve cover breather filter to keep warm, oil saturated crankcase vapours from re-entering your engine through the intake pipe. Allowing crankcase vapour to re-enter the engine hurts performance and leaves a nasty oily residue all over the inside surface of the intake manifold.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.