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Because of a leak, a bad PCV valve, or worn or broken piston rings that allow oil to seep into the cylinders and be burned along with the gasoline. Also, if the crankcase is overfilled, it may blow oil out the breather on the engine.
In the case of the PCV valve, there will be blue smoke coming out of the bottom of the engine. In the case of rings, it will come out of the exhaust pipe. If there is a leak, it should show on the ground where the car is parked. In the case of overfilling, you will have oil in the engine compartment someplace. This could also be the case in the event of a leak.
It is normal for an engine to burn some oil, but if it is down more than a pint in 5,000 miles, or if the engine has more than 100K miles, there is probably a repairable problem.
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∙ 15y ago
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