I dextron mercon 3 in mine $1.29 Qt has always worked well. I have used 85w gearoil before and I think its to thick on a cold day it pours like molassis so it puts alot more load on the motor. I would use the trans oil if I were you but its you choice.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, trails, riding tips, modifications, classifieds, accessories, troubleshooting, maintenance, and more!