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. '84-later Big Twin models with wet-type diaphragm spring clutch. Every 10,000 miles, or prior to winter or extended storage periods. All Big Twin models. Every 20,000 miles, or prior to winter or extended storage periods. '71-later XL and '83-'84 XR1000 models. Every 10,000 miles, or prior to winter or extended storage periods. Formulated for use in Harley-Davidson®Transmissions and the following Primary Chaincase applications: '71-later XL, '83-'84 XR1000, '08-'13 XR, and '84-later Big Twin models with wet type diaphragm spring clutch. Not for use in '02-later VRSC or '15-later XG models.