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Oil getting past the piston rings into the cylinder, or air fuel mix going the other way I think.


It's a little of both. Under power the fuel/air mixture gets forced past the rings on the compresion stroke. Witch also explains your power loss due to the fact that the rings are leting some of the mixture and the force from the combustion into the crank case. Hence the high crank case pressure. The oil is getting pushed into the cylinders, past the worn rings/cylinder walls, by the high pressure.
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Dan

"If you can't learn to do something well, learn to enjoy doing it poorly".

85 22RE, 5spd 4Runner project
87 Turbo Truck, Boost Controller, otherwise stock... for now.
86 Turbo 4Runner, Project