Asked in Antifreeze and Engine CoolantChevy LuminaChevy AstroToyota SR5
Oil leaking into antifreeze?
November 22, 2007 7:39PM
On the 3.1 and 3.8 L engines the lower intake manifold gasket is known to leak due to poor choice of gasket materials. This is evidenced by oil oin the coolant. It could also be a failed bypass line that is dripping coolant into the crankcase. Last it could be a cracked block , head or blown headgaslket. Further diagosis is neccessary. The LIM is not a tough job but if you don't have the tools get the job done by a mechanic. Make sure that the cooling system is also properly flushed and re-filled after the repair.