AMSOIL Premium Protection Synthetic Motor Oil is formulated to provide superior protection and performance in a wide variety of demanding applications. Its unique combination of synthetic base stocks and a superior additive package results in a formulation that exceeds the requirements of most gasoline or diesel applications that call for 10W-40 motor oil. Premium Protection Synthetic Motor Oil is ideal for high-mileage vehicles and high-stress vehicles subject to hot temperatures, heavy hauling, trailer pulling or off-road use. It provides the extra anti-wear protection required by engines with flat-tappet cams and high-tension valve springs. AMSOIL Premium Protection Synthetic Motor Oil offers flexibility and performance beyond conventional oils for convenience and trouble-free operation. AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics® to do the best job protecting your engine.

AMSOIL Signature Series Synthetic Motor Oil is designed to maximize energy efficiency for optimum fuel economy. Unlike conventional oils, its uniform molecular structure helps it flow more freely and reduce friction between metal surfaces. Anti-friction additives are included to further improve energy efficiency. Reduces Engine Wear Signature Series Synthetic Motor Oil provides outstanding anti-wear protection. It has excellent viscosity film strength to separate metal surfaces and robust anti-wear additives to further reduce wear in metal-to-metal contact regions for improved engine life.


Typical testAMSOIL-10w-40
Kinematic Viscosity @ 100°C, cSt (ASTM D 445)14.5
Kinematic Viscosity @ 40°C, cSt (ASTM D 445)91.7
Viscosity Index (ASTM D 2270)164
CCS Viscosity, cP @ (°C) (ASTM D 5293)5638(-25)
Flash Point °C (°F) (ASTM D 92)230(446)
Fire Point °C (°F) (ASTM D 92250(482)
Pour Point-44(-47)
NOACK Volatility, % weight loss (g/100g) (ASTM D 5800)6.7
(ASTM D 5481 @ 150°C, 1.0 X 106 s-1), cP4.3
(ASTM D 4172 @ 40 kg, 150°C, 1800 rpm, 1 hr), Scar, mm0.40
Total Base Number 12.1

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