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Lost /burnt oil
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Thread: Lost /burnt oil

  1. #1
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    Lost /burnt oil

    2015 abart 120,000 miles
    I just filled and maybe overfilled the oil and noticed it was smelling even though I didn't spill any while filling.
    This car has always lost/maybe burnt oil about 1 quart between changes.

    Today I tracked down this cylinder part on the engine near the battery side that has a hex bolt with fresh oil on it and smoke from burning oil.

    Thoughts

  2. #2
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    Quote Originally Posted by dlsnow View Post
    2015 abart 120,000 miles
    I just filled and maybe overfilled the oil and noticed it was smelling even though I didn't spill any while filling.
    This car has always lost/maybe burnt oil about 1 quart between changes.

    Today I tracked down this cylinder part on the engine near the battery side that has a hex bolt with fresh oil on it and smoke from burning oil.

    Thoughts

    I believe what you are describing is the vacuum pump which runs off the camshaft. It's pretty common for the gasket between the cylinder head and this pump to fail. It's a pretty thin gasket. Fortunately, replacing the gasket isn't very difficult so if you elect to have a shop do the work, don't let them charge you for more than one hour of labor.

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    What is even more common on this engine is for the rubber O-ring on the return drain of the Air-Oil Separator to shrink with age which allows the drain-back oil to flow out all over the camshaft cover on the driver-side end of the engine. This lost oil will pool around the base of cylinder #4 coil pack and it will run down the driver-side of the engine, which is right above where the catalytic converter transitions into the exhaust system, so there's plenty of opportunity for "burnt oil" smells

    Screen Shot 2019-10-31 at 12.07.30 PM.jpg

    This O-ring is a bit of a problem on these engines, it just doesn't make a very good seal between the plastic of the Air-Oil Separator and the metal of the camshaft cover. Mine developed a pretty good amount of leakage so I replaced the O-ring but the new O-ring immediately allowed almost as much leakage as the old O-ring was allowing.

    So I pulled the Separator off again and put (wrapped) some gasoline-proof teflon tape tightly around (and into) the O-ring gap on the camshaft cover to make the O-ring fit more tightly into the funnel-neck of the Separator. This has worked great for about 2 years now, absolutely no leakage.
    Last edited by ewflyer; 11-08-2019 at 01:58 PM.

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  6. #4
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    Check for fuel dilution of your oil through lab analysis of it. This can happen for many reasons. One being frequent starts with short duration trips, like what would be encountered if the car was mostly driven as a short run commuter. Oil diluted by bypassed fuel leads to oil loss and leaks, and excessive internal engine wear.

    Don’t only repair the leak(s). It (they) and the excess consumption had a cause. Not idling down after hard use is also a cause of damage to gaskets and seals, leaks and consumption...from heat soak and thermal shock. As well, if the aos seal is suspect, check for contaminated or otherwise faulty pcv valve, and restricted or leaking plumbing associated with crankcase ventilation. That can overpressurize the crankcase and also contribute to leaks. As well as repairing the leak(s), clean out the air oil separator, which is recommended as annual maintenance by Garrett and others.
    Last edited by pasomoto; 11-08-2019 at 02:06 PM.

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  8. #5
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    Thanks for the advice all.
    O pulled the engine cover/air filter box and don't see any leakage by the AOS connection but do definitely see the oil all over the vaccume pump. Suppose that gasket needs replacement and should replace the AOS Oring while in there.
    Thanks for the advice.
    The car isn't used on short trips...mostly really long ones but it is driven in sport mode and hard frequently.

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