I use RP in my gear and Diffs....working really well so far
^ i work for a transmission shop and im going to say your theory is wrong, to a point. I've seen a few cases where the wrong or cheap brand oil was used and caused damage. Their is a reason your paying more for quality oil and that reason is research and special additives in the oils. I know of many oils that arent compatible with others and may cause clutch problems. (Clutchs like in rears and transmissions, not belt clutch) Some things like a pressure washer i dont mind running walmart oils but in a machine that cost thousands use the best oil you can reasonably afford. Its cheap insurance. Amsoil is great so if your going to run it in your motor, might as well run it in the trans and rears imo. Next up would be mobil1. You dont have to change it that often so why not go with the best for an extra $20 or so
Thats actually completely understandable if you change it every few rides like you do. I would actually have no problem running the walmart stuff then. Most people dont understand that the cheaper stuff isnt the same and something like mobil1 or amsoil. It wont hold up time wise to the constant abuse the dirt puts on the machines. Right now i have a yfz450 quad and a wr250r dual sport bike. Quad gets the amsoil because i beat on it and the bike gets yamalube. I plan on switching to amsoil once i hit 5000 miles on the bike. Only reason im using the cheaper yamalube is because im changing oil every 1000 miles or less due to it being a new motor and breaking in still.You're right. What I should have mentioned is due to the fact that I ride a lot of mud and water I change it much more often than most people do. Every 2-3 rides at the very longest and may even put only one ride on oil if I know I rode a whole lot of water. The engine oil is easy to just check so I don't change that as often but I drain the diffs and trans very often.