AMSOIL Signature Series

Signature Series: Maintains Protective Viscosity

The main bearings in your vehicle rely on an oil film thinner than a sheet of paper. When motor oil loses viscosity due to a process called shear, it can fail to provide the required level of wear protection.

Shear (often called mechanical shear) occurs when one layer of oil moves in the opposite direction of another layer of the same oil. This often occurs between the piston and cylinder wall. These two oil films move in opposite directions under intense heat and pressure.

AMSOIL synthetic motor oil features naturally shear-resistant base oils combined with top-tier viscosity improvers to withstand extreme heat and shearing forces. In fact, Signature Series fights viscosity breakdown better than the competition*, providing superior protection of pistons, cams and bearings.

Signature Series stands up to the potentially devastating effects of viscosity breakdown and provides maximum engine protection.

*Based on independent testing of AMSOIL Signature Series, Schaeffer’s Supreme 9000 Full Synthetic, Lucas Synthetic, Valvoline Conventional Daily Protection, Mobil 1 Annual Protection and Pennzoil 5W-30 in the Kurt OrbahnTest. Oils purchased on 5/3/18.

For product information on AMSOIL Synthetic Motor Oil.

AMSOIL Now Offers Free Shipping to Online/Catalog Customers

Effective May 1, 2014, online/catalog customers in the continental U.S. will receive free shipping on orders of $100 or more. Customers who order less than $100 will be charged a flat shipping fee of $8.50.

Preferred Customers do not receive free shipping, but continue to save much more in discounts making the Preferred Customer option the best option in total savings in purchases of AMSOIL products.

To purchase products at the Preferred Customer price you need only visit the AMSOIL Online Store. Once you add the Preferred Customer option to cart, prices immediately drop to reflect Preferred Customer pricing. If you are already a Preferred Customer just login with your Preferred Customer number.