Descriptions  20W-50 Synthetic V-Twin Motorcycle Oil Engineered for maximum performance in V-twin engines, motorcycle transmissions and primary chaincases. Protects against extreme heat. Wet-clutch compatible. Advanced synthetic formulation resists viscosity loss to keep critical components clean and protected. See the Product Data Bulletin for full details. REDUCES WEAR DEPOSITS Resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.1 Contains heavy treatment of anti-wear additives to reduce wear in the most extreme operating conditions. Fortified with maximum levels of oxidation inhibitors to fight deposits for maximum engine compression and power. Resists Viscosity Breakdown AMSOIL resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.1   20W-50 Synthetic V-Twin Motorcycle Oil | MCV - AMSOIL WITHSTANDS EXTREME HEAT Formulated with naturally heat-resistant synthetic base oils that resist oxidation in extreme summer heat and during strenuous stop-and-go rally or parade traffic. Unique additive system helps keep engines clean and running efficiently in the toughest riding conditions. Prevented piston-ring sticking and protected against piston scuffing after 1,000 miles (1,609 km) of extreme-heat dyno testing during which cylinder temperatures reached 421°F (216°C) (see video below). 20W-50 Synthetic V-Twin Motorcycle Oil | MCV - AMSOIL PROTECTS TRANSMISSIONS PRIMARIES Shear-stable formulation resists thinning from mechanical activity to protect transmissions and primaries from wear. Performs like a gear lube without the negative effects of extreme-pressure additives. Delivers the convenience of one lubricant for all three sumps.