Making Sense of New Oil Specifications: GM dexos and API SN Plus

check your oil for vehicle longevity

As engine-operating conditions grow more severe, so do the demands placed on your motor oil.



Why Did We Reformulate Signature Series Synthetic Motor Oil?

amsoil signature series

Simply put, we reformulated Signature Series Synthetic Motor Oil to solve problems. For all the derision heaped upon the internal-combustion engine, it remains our primary mode of propulsion. And, despite the gains of hybrids and electric vehicles, it will remain so for the foreseeable future.