you can get this from lack of proper crankcase ventilation too. so i would check the ventilation system for clogs.

i had this on my 76 volvo with the renault v6. scary til i found the plugged vent tube.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.