I'll be changing out the MTF in a 2012 Honda CR-Z soon, which specs Honda MTF. My understanding is that this is an ATF-like fluid with an MTF-like add pack, per MolaKule. I take this to mean that it is like a modified Honda DW-1 ATF.
Since BOT 350 (in the guise of Mopar C-Series Manual Transmission Lubricant 75W GL-4) has a similar viscosity it seems like it would play nice with the Honda trans. The add pack seems very similar to the Honda fluid as well, if this is any indication. Compared to the UOA/VOA seen here for Honda MTF, the Castrol seems to be a bit more shear stable too.
Would using the Castrol gain me anything? The relative shear stability, GL-4 designation, and the fact that it is 'designed from the ground up' as a purpose-built manual trans oil are all pluses. I have no problem using the Honda fluid, but what would life on BITOG be without putting different fluids in applications they're not expicitly designed for?
Since BOT 350 (in the guise of Mopar C-Series Manual Transmission Lubricant 75W GL-4) has a similar viscosity it seems like it would play nice with the Honda trans. The add pack seems very similar to the Honda fluid as well, if this is any indication. Compared to the UOA/VOA seen here for Honda MTF, the Castrol seems to be a bit more shear stable too.
Would using the Castrol gain me anything? The relative shear stability, GL-4 designation, and the fact that it is 'designed from the ground up' as a purpose-built manual trans oil are all pluses. I have no problem using the Honda fluid, but what would life on BITOG be without putting different fluids in applications they're not expicitly designed for?