Re: Oil spots on air filter

Oil is blowing into the air filter from the crankcase breather tube 
that's attached to the motor's valve cover. Either the motor is showing 
signs of wear - piston rings allowing blow-by or, if it has a vacuum 
pump, a leak somewhere in the car's vacuum system is dumping air into 
the motor (vacuum pump exhausts into the motor in many cases) that air 
then needs to be expelled - into the air cleaner.

If the motor has done > 250,000 miles the rings become quite suspect 
except if you KNOW there's a vacuum leak(s) in the car.
-- 

© 2008 T.G.Lambach. Publication in any form requires prior written 
permission.