AMSOIL’s 20W‑50 100% Synthetic V‑Twin Motorcycle Oil in the 1‑gallon size delivers premium protection for your V‑twin engine, transmission and primary chain case. Designed for the rigours of air‑cooled V‑twin motorcycles, it resists viscosity breakdown, reduces wear and deposits, and keeps your engine running cool and clean under high heat. Developed and manufactured in the USA to exacting standards, AMSOIL sets the benchmark for performance and durability. AMSOIL is not affiliated with or endorsed by any motorcycle manufacturer.