Stopped by a Yamaha Dealer in my travels today to pick up some Rear Diff (Shaft Drive Gear Oil). I have been putting Yamalube SAE 80W90 part # ACC-11000-65-05 in it every year when I change it per dealers instructions.
They didn't have ACC-11000-65-05 and gave me ACC-Shaft-LU-00 (80W90) instead s...