Subaru Impreza, GD, GG (USA / CAN)

Differential fluid capacity & service interval

Subaru Impreza, GD, GG (USA / CAN) differential fluid capacity is 1 liter. Service intervals include checking at 30000 miles or 30 months and changing at 15000 miles or 15 months. The data covers 6 configurations.

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

TypeSpecifications
  • Impreza 2.5 WRX STi (CAN) (2006-2007)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1 liter
  • Check 30000 miles/ 30 months
  • Code: HK
  • Impreza 2.5 WRX STi (CAN) (2006-2007)
  • Rear, limited slip
  • Use: Severe
  • Capacity 1 liter
  • Change 15000 miles/ 15 months
  • Code: HK
  • Impreza 2.5 WRX STi (USA) (2006-2007)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1 liter
  • Check 30000 miles/ 30 months
  • Code: HK
  • Impreza 2.5 WRX STi (USA) (2006-2007)
  • Rear, limited slip
  • Use: Severe
  • Capacity 1 liter
  • Change 15000 miles/ 15 months
  • Code: HK
  • Impreza 2.5 WRX STi (2005-2006)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 30000 miles/ 30 months
  • Impreza 2.5 WRX STi (2005-2006)
  • Rear
  • Use: Severe
  • Capacity 1 liter
  • Change 15000 miles/ 15 months

Additional Notes

  • The Subaru Impreza 2.5 WRX STi rear differential fluid capacity is 1 liter across all listed configurations, covering both the standard rear differential and the limited slip rear differential variants.
  • Under normal use conditions, the service interval for the rear differential is a fluid check at 30,000 miles or 30 months, rather than a full fluid change.
  • Under severe use conditions, the interval shifts to a full fluid change at 15,000 miles or 15 months, which is half the distance and time span of the normal-use check interval.
  • The 2005-2006 Impreza 2.5 WRX STi is listed with a standard rear differential, while the 2006-2007 configurations for both USA and CAN markets specify a limited slip rear differential, representing a distinction in differential type between the earlier and later model year groupings.
  • The 2006-2007 model year range appears separately for USA and CAN markets, each carrying identical capacity and interval specifications of 1 liter capacity, a 30,000-mile or 30-month check under normal use, and a 15,000-mile or 15-month change under severe use.
  • A limited slip differential, as noted in the 2006-2007 entries, typically requires a fluid formulated to manage the friction characteristics of the clutch packs inside the unit, making the fluid type and change interval particularly relevant to maintaining proper differential behavior.

Other Systems