AMSOIL Synthetic
Small Engine Motor Oil

Uncompromising Performance.
Unmatched Protection.

AMSOIL Small Engine Oil is built to protect hard-working equipment such as lawn mowers, generators, and pressure washers. Its synthetic formula prevents deposits, reduces oil consumption, and keeps engines clean for longer service life and smoother operation.

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

Shop our full AMSOIL Small Engine Oil lineup and protect your engine with the best.

AMSOIL 10W-30 Small Engine Oil

Synthetic 10W-30 delivering superior wear protection and cleanliness for 4-stroke small engines.

AMSOIL 10W-40 Small Engine Oil

Synthetic 10W-40 for outdoor power equipment and compact utility engines running in hot conditions.

AMSOIL 15W-50 Small Engine Oil

High-viscosity synthetic for commercial mowers and air-cooled small engines running in extreme heat.

AMSOIL 5W-30 Small Engine Oil

Full synthetic 5W-30 for 4-stroke lawn mowers, generators, and outdoor power equipment.

AMSOIL Briggs & Stratton 4T Racing Oil

Officially approved synthetic for Briggs & Stratton 4-stroke racing classes, maximizing protection per class rules.

AMSOIL Formula 4-Stroke Synthetic Scooter Oil

Full synthetic protection for high-RPM air-cooled scooter engines, compatible with wet clutches.