Pressurized oil never gets near the head gasket,or cylinders, but water does. If it gets in a cylinder it will wash past the rings and mix with your oil. If your rings are seriously worn, it will be even easier. what doesn't wash past the rings will most likely go out the exhaust. A small amount of oil might get pushed back into the cooling system. When the engine is warmed up, the coolant becomes pressurized,and continues to be pressurized after shutting off. The oil is just sitting,or lying there waiting for the pressure to send it some water. The only pressurized oil in the cylinder would be from bad rings, and would only be pressurized at combustion time. If it made it into the coolant while running, when you stopped the engine, the pressurized water would be getting back into the cylinders. If oil,thicker than water can get through a hole, thinner water under pressure will go back the other way easier.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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