I have ran yamalube in my rhino and when I raced I ran it in the yz450f and have NEVER had a prob and trust me we ran the bikes hard !!! We were back to back HYR endurance champs at Glen Helen, that's a 3 race deal 6,12,24 hour race all yamalube. I'm not sayin its the best cause that's all I have used but it WORKS !