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Depends on what you mean by "car gearbox oil". Most if not all bikes come with a 10W30 motor (engine) oil in them from the factory. You will even see that listed in the owners manual.

As long as its not one of the "energy saving" oils with additives it won't hurt the clutch.

If you mean ATF (automatic Transmission Fluid); yes a lot of people run it as well.

Like the others have mentioned, I use Bel-Ray Gear saver 75W or 80W. By the way, gear oil uses a different standard, so the 75W is similar to ATF and the 80W is similar to a 10W30 for comparison. And make sure you don't get Bel-Ray 80W Hypoid gear oil, its really thick and meant for differentials.

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15y ago

What else can I help you with?