ok guys, this may have already been beaten to death, but, my '01 Blaster has been converted to pre-mix. the old owner used yamalube 2R-damn good stuff imo. I also have a 1997 yamaha RT-180 that i use the Yamalube 2S in the injector. why cant i run 2R in the autolube of the RT? I'm NOT going to pre-mix 2S in the Blaster. oil viscosity between the two seem to be the same. they both pour the same. i dont want to buy 2 different oils if i can help it. tail pipe spooge seems to be more on the RT than the Blaster. has anyone just said screw it and ran 2R in an injector with no ill side effects ? all b/s aside, what really is the difference ?