watch for any changes from the straight Mobil 1. I used the Lucas Synthetic Oil Stabilizer. It also says new car formula won't void warranties if that makes a difference. I have also had cars that went many miles with zero issues with straight oil, no additives but something about this just works great and no adverse reactions so far. I did order 2 test kits from black stone cuz I saved the straight 10 30 I took out of the car prior to the additive and will also take a sample from the car if not time for oil change then. I will def post follow up