Just checked the oil on my Envoy. 191K miles. Didn't realize I had 2600 miles on it since did an oil change. 5W/30 Mobil One Synthetic. Needed a quart to bring it back to full on the horrible yellow dipstick....so difficult to read sometimes. Anyways....one quart topped it off. Would this be considered excessive? Haven't done my top engine cleaning with the A.C. Delco product yet. Would this possibly help reduce oil consumption? Thanks for any input.