Question about 1985 Chevrolet Chevy
HI. If your car is equipped with an engine oil cooler that uses coolant to operate, this would be a good place to start (This is a big issue in some GM vehicles). Sometimes an engine oil cooler can act like a one way valve. When the engine is not running but is still hot the cooling system will have about 15 pounds of residual pressure forcing coolant into the engine. This problem can be repaired by replacing the engine oil cooler. Once the oil cooler has been replaced you must replace the engine oil and filter and recheck for the conditions once more. There are three remaining causes for coolant in the motor oil, and they all require you to dismantle the engine. This can be tricky because the repair overlaps and it is difficult to tell which one is causing the problem. For example: A mechanic has told you that the cylinder head is cracked, or warped, and as they start disassembling, they have discover it was the intake manifold gasket that has failed. It's up to the honesty of the repair shop to tell the customer that the cost of the repair will be less. Or the opposite can happen, example: A repair shop has told your engine has a blown head gasket, once the disassembling is complete, they inform you the head gasket is ok, and the cylinder has been pressure checked and is ok. This only leaves the engine block as the failure and must be replaced to repair the problem, and that can be very costly. Always check the intake gasket first on V6, V8 and V10 engines. Then the cylinder head gaskets, cylinder heads and finally the engine block.
Posted on Nov 15, 2009
Probably has a bad head gasket that is leaking between a coolant and oil passage.
Posted on Nov 15, 2009
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Posted on Jan 02, 2017
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