I know that this is an ongoing argument. When I received my car I immediately looked at the rear and there was a Mobil 1 sticker next to the engine cover. I had intended to change the oil at least after the first 1000 miles. So, I go to the dealer with my own oil of choice and the service manager advises me to wait at least to the first 5000 miles because of some "additives" in the oil used during the break-in period. At the 5000 mile mark I returned again with my oil of choice and they gladly changed it for me for a mere $26.63 (total - shop supplies, o'ring, oil filter, labor & taxes). What the additives are, who knows. It is anyone's guess or maybe he was just blowing smoke, but suffice it to say that they did not question me about my oil choice. The comment was that the choice was a good one.