7500 is SHORT nowdays it you use synthetic. Improved manufacturing/tolerances and synthetic oil improving lubrication and avoiding oil breakdown make short oil changes overkill. I am surprised at only 7400, most of my recent vehicles used computer translating to 10-12K. I tend to use Mobil 1 or Royal Purple, but most name brands are excellent (Castrol Synthetic, Valvoline etc). I avoid Quaker State, grew up as a mechanic and their old stuff was crap..