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International Automotive Technicians Network
Re: p0420/p0430
Posted to Technical Discussion Forum on 4/30/2023

In 40 years+ as a tech, I have NEVER seen any improvement to a vehicle that had a K&N filter installed. NOT ONCE. I HAVE seen plenty of trashed engines on the back side of a K&N. And additives to the oil? I would NEVER buy a used car that had one of those inst... Login to read more.