Geezer - Red Line carries a line of motorcycle oils, both in a 10W-40 and 20W-50...API SJ, SG, & SH. My son is running the 10W-40 in his Yahama R6, with a Wix filter...The 600cc motor on this bike redlines at 15K rpm ;)
Red Line Motorcycle Oils
These are ester based, Grp V oils with...