GM Dexos Engine Oil

April 26th, 2011 by

New for the 2011 Model year, GM introduced dexos1 certified engine oil as a factory fill and service fill for its gasoline engines worldwide. 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.

Dexos is a GM proprietary engine oil specification that has been designed to:

Further improve fuel economy and fuel economy retention through improved viscometric properties that create less friction in the engine, which allow the oil to maintain its fuel economy benefits throughout the longer life of the oil.

Provide a more robust formulation for added engine protection that offers improved oxidation and deposit-forming tendencies and aeration performance, which enables fuel savings devices, such as Variable Valve Timing, to work optimally.

Support GM’s Oil Life Monitoring System 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.

Dexos1 also is backward compatible for older vehicles; however, the owner

manual oil specification in prior model years remains acceptable.

The dexos specification includes two classifications.

GM will require dexos1 for global factory fill in spark ignited engines worldwide and service fill for gasoline engines worldwide. It will replace the GM6094M specification for most GM gasoline engines.

Dexos2, required for diesel engines as well as a service fill for gasoline engines in Europe, was introduced in Europe late last year ( 2010).

Dexos1 will be offered in these viscosities: SAE 0W-20, 5W-20, 0W-30 and 5W-30.

Dexos2 will be available in SAE 5W-30, 0W-40 and 5W-40.

Additional information about GM dexos engine oil is available on the GM dexos website,

Posted in Car Corner