As a derailed side note, I have a 2007 Silverado with 6.0 gas for work. Original owner. 365,000 miles and I just did it’s 7th oil change. When I get about 20k-30k on this oil change I want to get an oil analysis done and post it here. That boys will be your base line analysis with numbers to avoid, anything less and your good.
And yes when I sell the truck I’ll be straight up in the ad and say I used it, did shit maintenance, but here it is still running strong. Price reflect. I bet it’ll be quickest vehicle I’ve ever sold.