| do a test to check if the fuel injectors are clean and opening and closing properly.
it can happen for a fuel injector that is not sealing properly,so it spayed open letting a lot of gas into it, and then the liquid gas ends up inside the piston and forced trought the piston rings into the oil.. if very unlikely but could happen....
then go for the regular tune up, make sure everything is chagend, filters and fluids...
but i would definitely run a compression test and a leak down test, this way you can have a better idea of what is going on...
o yeah, one more thing. form the valve cover to the intake manifold, there is a hose to suck the air from inside the engine. this hose has a nonreturn check valve, but with time, and oil deposists, it clogs up..,, take a peek on the vacuum hoses and hoses around manifold.,
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