Hi guys, I just wanted to share my personal experience with oil consumption or burn-off with different kind of oils (all gm specs 4718m synthetic) with my 2005 cadillac cts with right now 113k on the odometer. The engine is the 3.6l vvt non-DI auto transmission. Each oil has been treated the same (a lot of idling, highway and city driving) since I do almost the same driving pattern to visit customers each 2 months. I drive about 1000 to 1500 kms per week. I just changed the oil 2100 kms ago with M1 5w30 and it still on the full mark, it didn't move. Mobil 1 5w30: 1 qt per 5-6k miles (approx. 8000-9500 kms) Mobil 1 10w30: 1 qt per 600 miles-1k miles (1000-1500 kms) PP 5w30: 1 qt per 2,5k miles approx. (4000 kms) PP 10w30: 1 qt per 2k miles approx. (3000-3400 kms) I have the UOA for the PP 5w30 and the M1 5w30 and it seems that its the same wears with both oil. The only difference is the tbn since I dont add the same amount of oil between oil change with M1 5w30. Is there a reason why my car drinks oil like I drink orange juice with the 10w30 M1 ? I think I'm going to stay with M1 5w30 since I have to add less top-off oil and get approx. the same results. I want to know your opinion with that.