Mobil 1 75W-90 gear oil here. I've used that and the Yamaha oil; no difference in sound or performance.
As far as filling, I fill it until the oil touches the first couple of threads in the fill hole. The first time I changed it, I filled it until it ran out the fill hole, then installed the fill plug. What happened after that was that I got a little bit of a leak as the fluid went past the seal and out the weep hole. Since then, I fill it to the lower edge of the threads, and no more leaks. That was about 5 changes ago; no leaks since.
2008 Gen II
When I was a track-a-holic on my R1 & R6, I used to think that the FJR was an old man's bike. Then I got one and absolutely love it. Hey...wait a minute!
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Last edited by Mad German; 06-15-2020 at 07:36 AM.