It is hard to argue with changing an injector every 30k miles too over 475k with only 2. So hard to argue that im not going to look a gift horse in the mouth and i am not willing to try any other oils. Synthetic is over rated. The truck with 675k on it gets 10k mile oil changes and 20k fuel filters however do the math we average 10k a month
475K and 675K on 6.0 trucks?