I just checked my daughter's Civic for oil and a clean air filter and noticed a round black greasy pattern on the bottom of it(the paper fins). I know the round shape is due to the air inlet after the filter pulling air in but the greasy black stuff surprised me.
I'm thinking their must be a leak somewhere near that is blowing oil from the engine in small amounts into the air filter.
Does anyone have any experience or opinions on this issue?
Thanks guys!
Ron T