Don't mean to slide off other peoples opinions but working with engines for the last forty years I'll tell you there are differences and most manufacturers do have upper end oils that are better for the equipment for logeviety then off the shelf! Many of the manufacturers also offer lower grades for lower prices(who'd of thought) that will get you by. I've seen the differences in engine as well as transmission life as well. You might not find any difference in the life that you might need but in machines that go 10,000 hours plus with no shop time other then oil changes I'd lay odds on it wasn't with off the shelf non brand name products. Your generic oils like penzoil, quaker state, shell rotella,kendall and the like you see in most stores are not normally the best they build or compareable to most manufactuers oil. It's your money you spent well to buy the best tractor now is the time not to look for a cheap way out. Most dealer do ship filters and oil so the need to leave home is not there anymore and still have the best.