Today i was completing a compression test when i noticed that the #4 spark plug on my 1988 toyota supra non-turbo had a lot of oil.The other spark plugs had some but not as much.Other people have been telling me that it could be that the VALVE COVERS ARE NOT TIGHTEN DOWN ENUFF.That seems to good to be true.I tried to tighten down the screws on my valve covers when i completed my head gasket job,but they don;t seem to screw all the way in to give it a proper seal.WHAT DOES ANYBODY ELSE THINK,i thought that it was f
rom bad PISTON RINGS OR BAD VALVE SEALS.can anybody help me out.
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