This bulletin applies to 2006-2009 Hummer H3 and 2003-2009 Hummer H2 vehicles. While some owners of these vehicles may request a fluid change for the rear axles, the service information and owner’s manual do not show a service interval for the rear axles with or without G80 locking differential.

According to GM, these axles do not need to be serviced under normal operation due to the synthetic fluid that is used from the manufacturer.

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