Q: black oil short time
My friend has a Tercel with 250,000 km on it. The problem is that the engine oil gets too dark too fast. It doesn’t matter which oil you put in it. The oil gets black in a short time even when you don’t drive very much. When he presses down on the gas pedal hard and accelerates dark blue oil comes out of the exhaust. But when he is driving slowly the smoke is no where to be seen. He always changes the oil by the manual. Do you have any ideas about what could be wrong with his car?
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