Thinking of selling my new 6.2L Denali...

[JKeller]

No offense was meant by anyone. I asked the question because it is highly unusual for someone to change oil at 15k miles on these trucks. That does not mean that it is wrong or anything else negative with the practice, it simply means that this specific oil change mileage interval is different than the norm. Regarding opinions, we all have opinions and we are all free to express them in a respectful manner.

No offense was taken. I agree that if I weren't using Amsoil Signature, I would be changing my oil either every 3k miles with conventional oil or 7,500 with Mobil 1 synthetic. I may do a blackstone analysis some day like someone suggested but it is hard to find the motivation to go through that hassle when the Amsoil comes out looking pretty clean at 15k, it has a fantastic reputation, and this truck is on its way to being my third high mileage vehicle with Amsoil.