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The main reason oil comes out of the top of an engine is pressure being built up in the crank case. This is because of bad rings that don't keep the compression inside the cylinder where it belongs. Try doing a compression check on each cylinder and you will find which cylinder is causing your problem. If you remove the oil filler cap and you have a lot of pressure and oil spray you can bet this is your problem.

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Q: Why is oil coming out the top of car engine?
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