Maxima V-Twin Synthetic Primary Oil is a 100% synthetic motorcycle gear oil formulated for high performance transmissions and primary chaincases. Designed for use in all 1984 and newer H-D models with wet diaphragm spring clutches. High film strength gear oil provides excellent protection against shock loads, wear and offers 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 and deposits for trouble-free operation.