Mazda B, UN (USA / CAN)

Manual transmission fluid capacity & service interval

Mazda B, UN (USA / CAN) manual transmission fluid capacity is 2,65 liters. Service intervals include checks every 6 months and changes every 100000 miles or 80 months. The data covers 5 configurations.

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

TypeSpecifications
B 2300 (2003-2007)
  • Use: Normal
  • Capacity 2,65 liter
  • Check 6 months
  • Change 100000 miles/ 80 months
  • Code: 5/1
B 3000 2WD (2003-2007)
  • Use: Normal
  • Capacity 2,65 liter
  • Check 6 months
  • Change 100000 miles/ 80 months
  • Code: 5/1
B 3000 4WD (2003-2007)
  • Use: Normal
  • Capacity 2,65 liter
  • Check 6 months
  • Change 100000 miles/ 80 months
  • Code: 5/1
B 4000 2WD (2003-2007)
  • Use: Normal
  • Capacity 2,65 liter
  • Check 6 months
  • Change 100000 miles/ 80 months
  • Code: 5/1
B 4000 4WD (2003-2007)
  • Use: Normal
  • Capacity 2,65 liter
  • Check 6 months
  • Change 100000 miles/ 80 months
  • Code: 5/1

Additional Notes

  • The Mazda B, UN (USA / CAN) manual transaxle fluid capacity is 2.65 liters across all five configurations covered for 2003-2007, spanning the B 2300, B 3000 2WD, B 3000 4WD, B 4000 2WD, and B 4000 4WD.
  • A 2.65-liter figure represents a service fill capacity, meaning the volume required when refilling a drained but otherwise intact transaxle rather than a full overhaul rebuild quantity.
  • The fluid check interval under normal use conditions is set at every 6 months for all five configurations, regardless of engine displacement or drivetrain layout.
  • The fluid change interval under normal use conditions is 100,000 miles or 80 months, whichever comes first, and applies uniformly across the B 2300, B 3000, and B 4000 variants in both 2WD and 4WD forms.
  • An 80-month change interval converts to approximately 6 years and 8 months, meaning time elapsed can trigger a fluid change well before the mileage threshold is reached in lower-mileage applications.
  • The identical capacity and interval specifications across the 2WD and 4WD versions of the B 3000 and B 4000 indicate that drivetrain configuration does not differentiate the manual transaxle service requirements within the 2003-2007 model range.
  • Engine displacement also produces no variation in the manual transaxle specifications, as the B 2300, B 3000, and B 4000 all share the same 2.65-liter capacity and the same check and change intervals.

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