Using oil between changes

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Take it to the dealer and have them do an oil use check. They will fill up the engine, seal it, and have you check it every few hundred miles. Then after a set period they will determine the oil usage.
Every engine uses oil, it has to, if not the rings would be sliding on dry cylinder walls and that is not good. However, oil usage is low, and 3 qts in 5500 miles is excessive.