Maxima V-Twin Synthetic Primary Oil Features A high-quality, synthetic-based motorcycle gear oil formulated for high-performance transmissions and primary chaincases Designed for use in all 84-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