Signature Series 0W-40 Synthetic Motor Oil
AMSOIL Signature Series Synthetic Motor Oil is engineered to outperform conventional and synthetic motor oils. It combines industry-premier synthetic technology with AMSOIL premium additives in a unique formulation that exceeds the higher performance demands of modern engines. Signature Series delivers the performance and value upon which the AMSOIL reputation is built. The culmination of more than 40 years of expertise, its exclusive formulation raises the bar for motor oil performance.
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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