Mineral versus Synthetic
Fact...
I used cheap 15W40 mineral car oil on my transalp for years without problems.
I used 5W40 synthetic car oil of the same brand one day, and soon my clutch would slip when accelerating in 5th gear.
There was still sufficient friction material on the clutch plates.
I guess some of the synth car oils are no good for your clutch. I guess they'll still get you accros Africa. Maybe with a slipping clutch.
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