Quote:
Originally Posted by 97 SL320
If this is really happening, you have a cracked piston. There is no way you can get enough oil to go past valve guides for this to happen that rapidly.
You will need to do a compression test / leakdown test before going any farther.
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That much oil can't get in the intake from a cracked piston IMO. The air is moving through the intake (higher than the intake ports) so no or very little oil can flow upstream against the air flow. Also, the intake valves would be closed when the piston is in it's upward stroke. It would also have enough blow- by to force oil through every gasket and seal in the engine. Removing the intake and downpipe and starting the engine will rule out a bad turbo, but I can't think of anything else that would cause that amount of oil to pass through the intake manifold and out the exhaust.