Modern automatic transmissions are more complicated than their predecessors. Today's designs feature more gears, clutch packs and narrow oil passageways that require a steady supply of high-quality fluid.

High-Quality Assembly Lube for Racing, Performance and Other Four-Stroke Engines AMSOIL Engine Assembly Lube (EAL) is formulated to cling to engine parts and provide exceptional wear protection, while inhibiting rust and corrosion in newly built or rebuilt four-stroke engines. It is designed to dissolve in oil, helping eliminate oil port clogging and deposit formation.

Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world's best motor oil. The result: engine protection that blows the doors off the highest industry standards.

AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines.

AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines.

AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines.

Specially Formulated for European Gasoline and Diesel Engines

AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines.

AMSOIL European Car Formula 5W-40 Synthetic Motor Oil is specially formulated for the lubrication needs of modern European gasoline and diesel cars and light trucks.

AMSOIL Synthetic 10W-40 Motor Oil is specially formulated to provide superior protection and performance in a wide variety of demanding applications.