The new engine oil specification has been developed to help meet the increased demands for enhanced engine efficiency. dexos™ oil helps deliver increased fuel efficiency and reduced engine emissions.Further improve fuel economy (to meet future Corporate Average Fuel Economy, CAFE, requirements) and fuel economy retention through improved viscometric properties that create less friction in the engine, which allows the oil to maintain its fuel economy benefits throughout the longer life of the oil
dexos™ is a GM proprietary engine oil specification that has been designed to:
Provide a more robust formulation for added engine protection that offers improved oxidation and deposit-forming tendencies and aeration performance, which enables fuel-saving devices, such as Variable Valve Timing, to work optimally
Support GM’s Oil Life Monitoring System (OLMS) by resisting degradation between oil changes
Ensure worldwide availability of equal quality oil while reducing the duplication of a large number of
internal GM engine oil specifications, replacing GM specifications GM-LL-A-025, GM6094M and GM4718M.
dexos™1 also is backward compatible for older vehicles; however, the owner manual oil specification in prior model years remains acceptable.