What does it mean when I pull my spark plugs and they are oily? I have a four cylinder and they are only oily on the number one and two cylinders. On three and four, they are fine. Thanks.
Have someone do a leakdown compression check on your engine. It sounds like your piston rings are leaking oil past them but the compression check will confirm that. With this kind of check you can tell where the leak is by listening to where the air is coming from.
