Hi jv3!
I used to put mineral oil in the bikes I had. But I tried synthetic oil on my KLR and I saw a difference.
The clutch plate on my bike like to stick together after a night sleeping. So in the morning, I have to put the bike in first gear, hold the clutch lever and then move the bike to unlock the plates. With mineral oil, I have to put a lot more effort to unlock the plates. With synthetic oil, the plate unlock very easily. So I guess the is less friction everywhere with synthetic oil.
Patrick
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