GM 3.6L VVT and intake manifold

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Thread: GM 3.6L VVT and intake manifold

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    GM 3.6L VVT and intake manifold

    I have a 2012 Chevy traverse with the 3.6L VVT engine. I was changing plugs yesterday and also cleaned the TB but when i removed the air intake tube that goes from the air filter box to throttle body had oil in it that was light colored. I checked the oil on the dip stick and it looked normal along with the oil change not too long ago. Also the antifreeze in the radiator looks ok. So my question is could it be the intake manifold gasket that is leaking?

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    Re: GM 3.6L VVT and intake manifold

    The intake manifold is dry so it wouldn't be an avenue to put coolant in the oil. BTW, didn't you have to pull the intake to get at the plugs? I did in my '10 which had the aluminum manifold, although I know at some point they switched to a plastic but don't recall what year? Just curious as we have a '17 and one day that's going to need plugs.

    Anyway that's just blowby from the PCV system (hence why it's nasty looking oil). If you look at the intake elbow, it has a depression in it that sort of functions as a poor man's catch can. What I do is pull it off at every oil change and wipe it out. That helps keep it from building up and eventually ending up on the TB blade. If it's higher mileage blowby will increase some with wear.
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