Well this will be my first new truck. I have Schaeffers oil. Well for this 21 would you run ams, Schaeffers or delo all would be in 5w-40 weight. Looking for a synthetic oil.
Does anyone know if this can be added after a vehicle is purchased. Looking at adding this now but my dealer says it can’t be done since I don’t have the RPO of 9L7. Sent from my iPhone using Tapatalk