I dont know if it would be okay on the m5r2, but I had a tremec 3550 (5 speed) trans in my mustang and those trannys called for either a standard Auto trans fluid or something called GM syncromesh. The GM syncromesh is like $10 a bottle I believe and its supposed to be good stuff. You have to get it at the Chevy dealer though "wonder where thats at"???? lol