Just my personal opinion but I wouldn't run Royal Purple in anything I cared about. I personally think it's junk! I have some experience behind me for making those statments too not just saying it. I have tried that sh*t in many outboard and sterndrive applications and if now a customer says they want that sh*t used in their motor or drive I tell them to hit the road. There is no way in hell I would ever consider using it in something that I care about like my cart! I use Mercury High Performance gear oil in my rear end of my cart.