Motul 10/40 dino... 80k miles on motor, 1st 10k on Yamalube 20/40, 90% Motul after that (Castrol GTX occasionally)..... motor never opened, 60k + on current clutch plates, 130 hp...... noticed smoother shifting after 1st change to Motul......... if you've ever read a Bel-Ray ad, that would be my...