I have a 89 chevy 6.2L diesel with a Banks turbo that is blowing oil out the dip stick spout when I make it work hard, over 2 lbs of boost. When I remove the oil filler cap there seems to be a lot of blow by but the engine is still strong. I'm going to do a compression test, what should the compression be? I suspect a bad head gasket. What else might it be?
Pete