yes, I'm bored and can't sleep. so, I've reviewed and can't find where I've argued oil on this forum, so here goes. modern oil is good oil. no two motors are put thru the same paces, nor exposed to identical conditions. some folk need 5w20. some need 15w50. but for the cb, I will say this... change it often. One thing any oil is for, is to clean out the gunk. The CB holds 5 quarts, and we can only change 4 of them. So dirt is staying in there. so change it often. and, yes on mine I feel a noticeably smoother shift with fresh oil.