Pontiac Montana (USA / CAN)

Differential fluid capacity & service interval

Pontiac Montana (USA / CAN) differential fluid capacity is fill up to lower edge of level plug opening. Service intervals include normal use. Data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • Montana 3.9 SV6 E85 (CAN) (2007-2009)
  • Rear
  • Use: Normal
  • Fill up to lower edge of level plug opening
  • Montana 3.5 SV6 (2005-2006)
  • Rear
  • Use: Normal
  • Fill up to lower edge of level plug opening
  • Montana 3.9 SV6 (2005-2009)
  • Rear
  • Use: Normal
  • Fill up to lower edge of level plug opening

Additional Notes

  • Across all three configurations covered in the 2005-2009 range, the rear differential fill specification is defined by position rather than a fixed volume, with fluid added until it reaches the lower edge of the level plug opening.
  • A position-based fill method of this kind is standard practice for differentials where the housing geometry determines the correct fluid level, making a measured capacity figure unnecessary for a service fill.
  • The Pontiac Montana 3.5 SV6 carries rear differential specifications for the 2005-2006 model years, while the 3.9 SV6 variant extends the same specification across the full 2005-2009 span.
  • The 3.9 SV6 E85 configuration, designated for the Canadian market, shares the identical level-plug fill method as the non-E85 3.9 SV6, covering the 2007-2009 model years.
  • All three rows are listed under normal use conditions, meaning the fill specification applies to standard operating environments rather than a severe-duty or first-change scenario.

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