* Group III base oils: These are synthetic base oils made from VHVI (very high viscosity index) petroleum. AMSOIL Group III base oils are highly refined and have a low sulfur content, which makes them ideal for use in high-performance engines.
* Group IV base oils: These are synthetic base oils made from PAO (polyalphaolefin). AMSOIL Group IV base oils have a high viscosity index and a low pour point, which makes them suitable for use in cold climates.
* Group V base oils: These are synthetic base oils not typically produced in large volumes. AMSOIL Group V base oils include esters, polyol esters, and perfluoropolyethers. AMSOIL Group V base oils offer excellent performance properties, such as high thermal and oxidative stability, low volatility, and good wear protection.
AMSOIL sources its base oils from various refiners around the world. The company has a rigorous quality control process in place to ensure that all of its base oils meet its high standards.
Here are some of the refiners that AMSOIL has sourced its base oils:
* Chevron
* ExxonMobil
* Shell
* Valvoline
* Warren Distribution
AMSOIL also produces some of its own base oils at its facility in Superior, Wisconsin.
