ok I need a lil help I have a k & n air filter, need to know what kind of oil ya use after ya clean it ? just standard 10/30-10/40 ? thx tam

arguably, K&N air filter oil is the best thing to use when oiling your K&N filter.

Or at least its what I have always used.

Do not use standard engine oil, it is far too thick for the job at hand.