6 Speed synthetic technology is now available for the Harley® Sportster/Buell®. Spectro® Heavy Duty Platinum Sportster Transmission Lube is a fully formulated synthetic transmission lubricant engineered to work in all applications where the same oil lubricates the clutch/primary/transmission. A.P.I. GL-1 rated. Dyed green. Exceeds all known OEM and Harley Davidson® warranty requirements.