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How to find out why the engine is consuming oil. Or how to determine the oil consumption of the car you are buying. It is enough to unscrew the spark plug and look at it. If the valve seals, also known as oil scraper caps, are leaking, then the threaded part will be in oil. If part of the insulator and the skirt with the mating part of the electrode are all in soot, the reason is in the piston oil scraper rings