I just bought a 2014 Silverado with a 5.3 last November. This truck will see about 1500 - 2000 miles a month, 95% highway/interstate use and using E-85 about half the time. Currently I have about 4100 miles on the truck with my oil life monitor showing 42% oil life left. Once I hit about 7500 miles, I will drain the original fill oil, get a sample from Blackstone and refill with Amsoil and will use an Amsoil oil filter. This will be my first experience with the stuff. I normally use whatever synthetic or semi-synthetic that is on sale. Stay tuned...