Hondamatic Oil

[pmprogrammer]

Pic below shows the oil viscosity recommendation from the '77 CB750A owner's manual. I'd like to use synthetic oil made for motorcycles in my CB750A Hondamatic. But I'm a tad worried about those internal clutches. Has anyone in the forum used and can vouch for using synthetic oil in your Hondamatic without causing problems with the clutches?

Thanks,
PM

 

[cmg]

I would stick to the manual.