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Ah! The slight of the hand!Cummins does not "recommend" Valvoline. The article simply states it is approved for use in Cummins engines, as are a lot of other oils.
ANY oil that meets Cummins CES20086 spec is suitable for use in Cummins engines.
The Valvoline Premium Blue lubricants portfolio has been exclusively developed, extensively tested and officially approved for Cummins engines.