Maxima Racing Oils 40-04901 V-Twin Mineral Engine Oil - 32 fl. oz. Maxima V-Twin Primary Fluid is a high-quality, mineral based motorcycle gear oil formulated for high-performance transmissions and primary chain cases Designed for use in all 1984 and newer H-D models with wet diaphragm spring clutches Extreme pressure additives and surface active chemistry protect against shock loads and allow smooth shifting under peak loads and RPMs Robust formula resists mechanical shearing and heat breakdown of the oil Ultra-clean detergents protect gears from wear, deposits and allow for trouble-free operation