Many motorcycles have wet clutches, and all that do will be at risk of having their friction material contaminated by the anti-friction additive present in car oils. Motorcycle oils don't have this, so you should always be fine if you use an oil specifically designed for use in bike engines. That said, bike oils are damned expensive, and I do quite high mileages (3,500 + miles a month) even when I'm not travelling, so I usually use car oils because they're cheaper. I had clutch slip on my previous two Transalps, but much of this was due to wear of the friction plates. The rest, I'm sure, WAS due to the oil because when I used car fully synthetic oil rather than mineral oil, it always made the slip worse.....
In short, stick to proper bike oils if you can afford to, and don't use friction modifying additives. If not (or if all you can get is car oils) go for car-spec stuff. My view is that I'd rather have an unworn engine with a slipping clutch than a knackered one with a healthy clutch.
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Tall men see everyone else's bald patch but their own.......
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