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Seem to remember reading that too much oil can block a solanoid up somewhere ....bring on the experts
Dave
Yes best to drain it out otherwise it can contaminate the boost solenoid and cause overboosting. Oil level should be at the low mark on the dip stick when cold, the high mark when warm.
Drain the excess immediately. I put to much oil in a small van I used to drive, I approached a hill and the oil spilt somewhere which caused the engine to rev out of control.
Smoke bellowed out of the engine and the van stopped once the head gasket had finally blown.