AMSOIL Synthetic
4-Stroke Motor Oil

Uncompromising Performance.
Unmatched Protection.

AMSOIL 4-Stroke Oil offers dependable protection and reduced friction for motorcycles, ATVs, and power equipment. Its synthetic formula ensures consistent viscosity and excellent performance across a wide range of operating conditions.

Ready to upgrade? AMSOIL motor oils outperform leading brands like Mobil 1™, Castrol™, Valvoline™, and Shell Helix™.

Shop our full AMSOIL 4-Stroke Oil lineup and protect your engine with the best.

AMSOIL 10W-30 Small Engine Oil

AMSOIL 10W-30 Synthetic ATV/UTV Oil

AMSOIL 10W-30 Synthetic Marine Engine Oil

AMSOIL 10W-30 Synthetic Metric Motorcycle Oil

AMSOIL 10W-40 Small Engine Oil

AMSOIL 10W-40 Synthetic ATV/UTV Oil

AMSOIL 10W-40 Synthetic Dirt Bike Oil

AMSOIL 10W-40 Synthetic Marine Engine Oil

AMSOIL 10W-40 Synthetic Metric Motorcycle Oil

AMSOIL 10W-50 Synthetic Dirt Bike Oil

AMSOIL 10W-60 Synthetic Dirt Bike Oil

AMSOIL 15W-50 Small Engine Oil

AMSOIL 15W-50 Synthetic Metric Motorcycle Oil

AMSOIL 15W-60 Synthetic V-Twin Motorcycle Oil

AMSOIL 20W-40 Synthetic V-Twin Motorcycle Oil

AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil

AMSOIL 25W-40 Synthetic Marine Engine Oil

AMSOIL 5W-30 Small Engine Oil

AMSOIL 5W-40 Synthetic ATV/UTV Oil

AMSOIL 5W-50 Synthetic ATV/UTV Oil

AMSOIL Briggs & Stratton 4T Racing Oil

AMSOIL Formula 4-Stroke Powersports Oil

AMSOIL Formula 4-Stroke Synthetic Scooter Oil

AMSOIL SAE 60 Synthetic V-Twin Motorcycle Oil

AMSOIL V-Twin Oil Change Kit (HDBK)

AMSOIL V-Twin Oil Change Kit (HDCK)

AMSOIL V-Twin Oil Change Kit (HDMB)

AMSOIL V-Twin Oil Change Kit (HDMC)