Question about 1995 Pontiac Bonneville

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When i checked oil it looked milky - 1995 Pontiac Bonneville

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Water or coolant is getting in oil. could be a bad head gasket. If the coolant level continues to drop, but there are no signs of coolant leaks on the ground or from the exhaust pipe, there is a good chance that coolant is entering crankcase and mixing in with the oil. check head gasket and manifold gasket for leaks.

Posted on Mar 30, 2011

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There is water in the oil. If the engine has been sitting for a long period that could be the cause. If this is the case change the oil and filter. If not the most likely reason is a bad head gasget. If this is the case you may also see steam or coolant coming from the exhaust pipe.

Posted on Mar 30, 2011

  • honeymokey
    honeymokey Apr 01, 2011

    Most likely a bad intake gasket. 3800's don't have head gasket problems. Having worked at a buick dealership for a number of years I have only seen one bad head gasket and it was a non GM gasket.

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SOURCE: have very slow water leak.. can not find where it

milky oil would suggest water has mixed in with it. this added to a slow, unfound water leak points toward a head gasket problem with the coolant escaping from the cooling system, into the oil.
this needs to be sorted out fairly quickly. apart from the obvious problems of a water leak and the risk of overheating, oil with water in it will not lubricate the engine properly and there is a serious risk of engine seizure.
a garage should be able to do a simple test on the oil to discover if it is coolant contaminating the oil.
a pressure test on the cooling system would also confirm where the coolant is being lost.

Posted on Mar 30, 2011

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