Question about 1999 Chevrolet Tahoe

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My engine oil looks like chocolate milke shake what could be the cause? i checked my spark plugs and the middle two on the passenger side were covered in oil mostly the bottom of the plugs. i drained my oil so i can replace the head gasket but i dont know if the head gasket is the cause of the oil looking like a chocolate milkshake

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In some cases I have seen blown intake manifold gaskets cause a milkshake in the crankcase inspect the lower intake gaskets coolant passages at the end of the cylinder heads for damage. I would suggest a compression test and a cylinder leak down test befor further tear down.

Posted on Jul 02, 2009

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If the head gasket is gone then you will discharge water into the engine bores that goes into the sump and mixes with the oil

It is stirred up by the crankshaft and you get a brown mayonisse.

The only problem you may face is if it is a crack in the engine block letting water transfer down that way , then it is a new block

Posted on Jun 30, 2009

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It is a blown head gasket or a cracked head. coolant is getting into the oil.
Or, unlikely, but it could be a bad pcv valve that is not venting moisture from the engine.

Posted on Jun 30, 2009

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