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Oil water mix

posted by  the454assassian on  Tue Jan 3 19:46 CST 2012
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last visit: Wed Jan 4 17:32 CST 2012
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I was doing some maintenance to my 99 s80 2.9 today and found something disturbing. Recently it has been using coolant so I was replacing some questionable heater hoses. When I removed the air duct from the bottom of the intake I found an oil and water mix in the tube. A few weeks ago I thought my wife may have blown the head gasket again when she told me it ran hot( she does not understand the concept of reading gauges). But I filled the coolant back up and it ran fine. This is the first time I have ran across the oil water mix in an intake air duct. Any thoughts or tips before I start with the compression test tomorrow?








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    Oil water mix

    posted by  KlausC on  Tue Jan 3 21:52 CST 2012
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    last visit: Fri Oct 24 10:15 CST 2014
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    I had to think about this for a while.

    If your 2.9 is a turbo, I would expect some oil in the intake. There is a natural amount of oil that will blow by the seal, usually just enough to coat the air intake. If you don't give it full boost once in a while, the oil will just accumulate at the low spots.

    Water? It depends on the temp and humidity. Again, with the engine only running at lower rpms, water will accumulate. There should NEVER be any antifreeze...

    The 2.9 is known for headgasket leaks, if the antifreeze is not flushed every 3-4 years and replaced with G5 or OEM. The block is porous, ask anyone that has a 960. Get a compression test. And check for leaks under the overflow bottle and/or cracks in the bottle cap.

    Good luck,

    Klaus
    --
    My advice is free, so you got what you paid for...







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