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Assuming no obvious oil leak, then the oil may be getting past the oil control rings on the pistons, and burning. I haven't tried it yet myself, but there is a new valvoline "restore and protect" that several of the oil experts have reviewed, and said it does an amazing job of removing...

did you do your long drive with the oil flush in the engine? Any that I've seen you add it before the oil change, and idle the engine for 5-10 min, then dump all the oil/flush and refill with fresh. I'd never drive the car with any kind of oil flush mixed into the oil. As you say, it would be...