Subaru WRX, VB (USA / CAN)

Differential fluid capacity & service interval

Subaru WRX, VB (USA / CAN) differential fluid capacity ranges from 0,8 to 1,25 liters. Service intervals include checks every 30000 miles or 30 months and changes every 15000 miles or 15 months. The data covers 4 configurations.

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

TypeSpecifications
  • WRX 2.4T (2021- )
  • From automatic
  • Use: Normal
  • Capacity 1,15-1,25 liter
  • Check 30000 miles/ 30 months
  • WRX 2.4T (2021- )
  • From automatic
  • Use: Severe
  • Capacity 1,15-1,25 liter
  • Change 15000 miles/ 15 months
  • WRX 2.4T (2021- )
  • Rear
  • Use: Normal
  • Capacity 0,8 liter
  • Check 30000 miles/ 30 months
  • WRX 2.4T (2021- )
  • Rear
  • Use: Severe
  • Capacity 0,8 liter
  • Change 15000 miles/ 15 months

Additional Notes

  • The front differential (sourced from the automatic transmission) on the Subaru WRX, VB carries a capacity range of 1.15–1.25 liters, while the rear differential holds a fixed 0.8 liters, placing the two units at noticeably different fill volumes.
  • The capacity range of 1.15–1.25 liters for the front differential reflects a service fill tolerance rather than a single fixed value, which is typical when fluid level is verified by a fill-to-overflow port rather than a measured pour.
  • Under normal use conditions, both the front and rear differentials share the same inspection interval of 30,000 miles or 30 months, with no fluid change specified at that point.
  • Under severe use conditions, both differential positions move to a fluid change interval of 15,000 miles or 15 months, cutting the service period in half compared to normal use.
  • The distinction between a check interval under normal use and a change interval under severe use means the two service schedules represent fundamentally different service actions, not simply different mileage thresholds for the same task.
  • The rear differential capacity of 0.8 liters remains consistent across both normal and severe use rows, confirming the fill volume is independent of the service condition applied.

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