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.
Which gearbox oil is right for your motorcycle? Castrol Syntrax Limited Slip 75-90 is a premium gear oil ideally suited for shaft drive motorcycles. This full synthetic formulation uses pioneering lubrication technology that far surpasses conventional API GL-5 and MT-1 gear oils. It has full synthetic durability for maximum performance and wear protection under severe riding conditions.
Castrol Axle Limited Slip 80W-90 is a multi-grade gear lubricant that promises superior performance in manual transmissions and differentials. It also meets the full-service requirements of conventional and limited-slip differentials, ensuring that you stay in line with the recommendations of your motorcycle’s original manufacturer.