Dexos1 oil
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Found the info I was looking for:
In North America, starting with the 2011 model year, GM introduced dexos 1™ certified engine oil as a factory fill and service fill for gasoline engines. The reasons for the new engine oil specification are as follows:
• To meet environmental goals such as increasing fuel efficiency and reducing engine emissions.
• To promote long engine life.
• To minimize the number of engine oil changes in order to help meet the goal of lessening the industry's overall dependence on crude oil.
dexos 1™ is a GM-developed engine oil specification that has been designed to provide the following benefits:
• Further improve fuel economy, to meet future corporate average fuel economy (CAFE) requirements and fuel economy retention by allowing the oil to maintain its fuel economy benefits throughout the life of the oil.
• More robust formulations for added engine protection and aeration performance.
• Support the GM Oil Life System, thereby minimizing the replacement of engine oil, before its life has been depleted.
• Reduce the duplication of requirements for a large number of internal GM engine oil specifications.

(and scheaffers synthetic is still the only oil that will float main bearings with zero oil pressure.....)


