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Signature Series Synthetic Motor Oil: The Best We’ve Made
By 2020 it’s estimated that U.S. drivers will have endured 8.3 billion hours of stop-and-go driving conditions. Heavy traffic doesn’t just tax your sanity, it takes a toll on your engine too.

Most engine wear occurs while idling or driving at low speeds under cooler engine temperatures. Stop-and-go traffic, warming up a vehicle in the winter and the extended idling common to commercial vehicles are all common situations that can accelerate wear.

How Temperature and Speed Affect Wear
Engine components expand and contract with changing temperatures. Cylinders and pistons are only perfectly round when an engine is at optimal operating temperature. When your engine is running but is not up to operating temperature, tight tolerances can cause wear. At slow speeds your oil pump isn’t moving as much oil through the system, further increasing the risk of wear.

The Sequence IVA Engine Test
The Sequence IVA Test was developed to simulate the stresses commonly placed on the engines of taxis, delivery vehicles and commuter service vehicles. It measures the ability of crankcase oil to control camshaft lobe wear. Worn or damaged cam lobes can lead to a loss in efficiency, increased engine noise and expensive, large-scale repairs. The Sequence IVA Test is a great metric for assessing an oil’s level of wear protection – the top concern among enthusiasts.

Signature Series Vs. Engine Wear
AMSOIL Signature Series Synthetic Motor Oil develops a strong fluid film that keeps metal surfaces separated, while its robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life. We submitted the lightest viscosity in the line, Signature Series 0W-20, to further increase the severity of the 100-hour test. AMSOIL Signature Series Synthetic Motor Oil provided 75 percent more engine protection against horsepower loss and wear (Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification) than required by the Sequence IVA Engine Test, extending the life of vital components like pistons and cams.

AMSOIL Warranty


Like our products, the AMSOIL Limited Warranty is built with an extra measure of protection. While some other oil companies guarantee their products only until you reach a specified mileage we don't place restrictions on our warranty coverage based on total vehicle miles.

We stand behind our products for as long as you use them.

AMSOIL Products Impress Engine Builder
AMSOIL Engine Masters Challenge competitor Joe Carroll, of PTS Racing Engines, in Stonewall, La., uses AMSOIL synthetic lubricants in his competition engines. But he doesn’t stop there – the performance he saw in the dyno convinced him to try AMSOIL products in some of his other vehicles, too.