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International Automotive Technicians Network
Re: Oil in cooling system - GM 3.1 V-6 'J or M'
Posted to Technical Discussion Forum on 8/30/2007

Scott, a possibility here... when the cooling system cools off and contracts, it pulls oil in from the weakest part of the gaskets. Or, the oil pressure is 5 times more than the cooling system pressure, so it may push it in that way?

Either way, it's usually... Login to read more.