all i have been having an issue with loosing oil from my 4.0 engine in the 93 wrangler. This past fall i replaced the oil pan and rear main seal gaskets and still no fix. I know that with those two the other common leak is the valve cover, but the thing is i can never find oil ever leaking nor by the valve cover. About once a month I have to add a quart of oil. I did notice though on the last oil change there was oil residue in my air filter. So I was wondering if anyone may know what is causing this. The engine seems to run fine it is just annoying to have to add the quart every month plus not easy on the wallet once it starts to add up.
Thanks for any info