And this is why you use Rotella T4 15w-40, T6 5w-40 or T6 15w-40 as those are all JASO MA certified for use in motorcycles.... And to go one step further, use either of the 15w-40 as they have way better shear strength. (T4 has been thoroughly tested for this vs the T6 5w-40.... jury is still...