I've read all the thread responses regarding clutch judder/noises and never saw recommending the proper spec oil. I bought my used
2022GT with 24K miles and noticed a little clutch roughness/noise when engaging. Seemed less so after it got warm. No big deal
since I was learning what noises are "normal" (?) for a bike with 24K miles. When I took possession, I asked the previous owner what
oil he used for oil changes. He told me Mobile One 15w/50. I asked if it was automobile or motorcycle oil. He looked confused and
responded "is there a difference?". He had used automotive oil. I have a Bonneville that has a wet clutch vs my BMW, which has a dry clutch.
The GT manual clearly recommends API SH and "JSO MA" spec. The JSO MA additive(?) is the difference. After a couple hundred miles
of getting use to the bike, I changed the oil using the recommended SPEC (JSO MA) oil and within 10 miles I noticed the clutch was
quieter and smoother when engaging. I'm convinced the proper spec oil is the difference.
Loving the bike the more I ride it.......
Larry