Any oil is better than no oil....
That whole 'car oil makes your clutch slip' is a bit of a forum myth.
I'm not saying it's not a contributing factor with the 'slip modifiers' in certain expensive car oils, but looking at the bigger picture, it's not that bad.
Don't think that if you will put car oil in your bike the clutch will instantly start slipping.
IT WON'T !!!
I've ridden tens of thousands of miles on many bikes with car oil in and never had a clutch clip. If you know how a clutch works, it takes a hell of a lot of effort to release those spring pressured plates.
If your clutch is already worn out and already close to slipping then it might. But I don't think anyone has tested this theory.
If you're low on oil, or your oil is considerably worn out, car oil will do you more good than harm.
But obviously, getting motorcycle oil will remove any uncertainly.
Oil also lasts longer than the manufactures tell you it does. They want you in their dealers every year for a service so they can make £££££££££££££££££££££££.
I know someone with a GPZ500 that has had the same oil in it for ten years and 50,000 miles. And it still runs well.
But obviously.. New oil is better.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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