So I noticed alot of oil was being sprayed on the underside of my hood and I also found my air filter saturated in oil upon inspection. I thought it was from the valve cover gasket so I had my mechanic replace it. I then began to wonder why my filter would be so full of oil and im assuming its coming from the tube that is on top of the valve cover and goes into the airbox. my jeep is a 1990 4.0L auto w 186k miles, any ideas as to why oil is soaking my air filter?? btw when I had my valve cover replaced the mechanic did say there was quite a bit of sludge build up in there so i have done 1 engine flush so far an am considering doing it again this weekend since i have soo many miles.