I used Castrol Magnatec and it didnt cause any slippage.
I believe Magnatec is an Ester based oil which are polar and therefore "stick" to the metal providing added protection ie Magnat(ic)ec.
You only need to be wary of "economy oils" which are usually xW30 and below because these, anecdotally at least, have caused clutch slippage.
Oil always brings up debate. Your manual states something like API SG or SH or higher (we are now on SM) so any oil that meets these specs and the viscosity ((10W40) for your Busa will be fine.
Cheers
I believe Magnatec is an Ester based oil which are polar and therefore "stick" to the metal providing added protection ie Magnat(ic)ec.
You only need to be wary of "economy oils" which are usually xW30 and below because these, anecdotally at least, have caused clutch slippage.
Oil always brings up debate. Your manual states something like API SG or SH or higher (we are now on SM) so any oil that meets these specs and the viscosity ((10W40) for your Busa will be fine.
Cheers