Everywhere I read the B38 required 5w-30. There is a sticker under my 2016's hood that clearly states 0w-20. I called the dealer and they asked for the vin because somewhere down the line the oil spec changed. This is a California car so I don't know if that has anything to do with it or if the motor had changes made to it. My car will be tuned and I will do all the maintenance myself (I just do not trust dealers) so i want to run a robust oil. They would not give me a explanation as to why the change. Please school me on the oil requirements for this motor.