There is no such thing as standard motorcycle gear oil, and if your bike is shaft drive, you're going to need the protection of a limited slip gear oil.
Motorcycle gear oil page
Whether your motorcycle has a two-stroke or four-stroke engine, getting the gearbox oil right is essential. Your bike probably has a wet clutch, in which case it shares your motorcycle’s engine oil.
However, if you’re riding a shaft-drive motorcycle, you’re going to need limited slip gear oil too, providing the durability and protection of a full synthetic formulation created by liquid engineering.
Castrol Scooter Gear Oil 80W-90 is high performance gear oil specially recommended for all makes of gearless scooters.
Product Performance Claim
Available in the ff grade