Join Date: Aug 2007
Location: Vancouver Canada
Motorcycle: 1985 GSXR 750, 1986 GSXR Limited, GSXR750RK (in restoration mode), 1973 GT-750 (no longer have, looking for another)
I like Shell Rotella T6 Synthetic 5W-40.
I read a massive writeup on oil types about 10 years ago and the bottom line was that oil cooled motorcycles share a lot of the environmental issues that diesel engines have, so Rotella T6 seems like a good fit.
My 85 GSXR must have at least 150,000 Kms on the engine now and it keeps going strong with Rotella. I just put another 2,200km on the bike over a 4 day trip last week. Shifts great and runs smooth.