Mmmm....don't most dry sump motors also have shared gearbox and engine oils? LC4 for sure, Rotax 4T family? Most Japanese 600cc+ singles?
The only exception I can think of is the Honda motor that powers the Montesa 4RT trials bike (itself derived from the CRF250) which has separate gearbox and engine oils.
I thought that 'oil sharing' is the reason why we have motorcycle specific 4-stroke oils i.e. they're designed to work in the engine and gearbox. And why it may not be wise to use car engine oil in a 4 stroke motorcycle i.e. it's not designed for use in gearboxes.
That said, I'd guess a bike with wet sump engine is cheaper to produce than a dry sump - no oil tank etc. But isn't one advantage of a dry sump engine that the oil can be circulated externally to the engine and therefore be cooled?
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