Developed with a proprietary mineral basestock formula and TESTED-CERTIFIED by Harley-Davidson^® Motor Company, Formula+ is blended to provide lubricity for the anti-wear requirements of transmission gears. Formulated to maintain the coefficient of friction for proper clutch operation and provide adequate lubrication to the primary chain, this lubricant is approved for use in all stages of transmission and primary chaincase life. Not for use in the crankcase as a motor oil. TESTED-CERTIFIED Extended Service intervals listed below.