Mazda B, UN (USA / CAN)

Transfer case fluid capacity & service interval

Mazda B, UN (USA / CAN) transfer case fluid capacity is 1,2 liters. Service intervals include changes at 60000 miles and 150000 miles. The data covers 4 configurations.

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

TypeSpecifications
B 3000 4WD (2003-2007)
  • Use: Normal
  • Capacity 1,2 liter
  • Change 150000 miles
B 3000 4WD (2003-2007)
  • Use: Severe
  • Capacity 1,2 liter
  • Change 60000 miles
B 4000 4WD (2003-2007)
  • Use: Normal
  • Capacity 1,2 liter
  • Change 150000 miles
B 4000 4WD (2003-2007)
  • Use: Severe
  • Capacity 1,2 liter
  • Change 60000 miles

Additional Notes

  • The Mazda B, UN transfer case fluid capacity is 1.2 liters across all listed 4WD configurations, a figure consistent with a service fill rather than a full overhaul, which typically requires draining and refilling without disassembly.
  • Both the B 3000 4WD and B 4000 4WD share an identical 1.2-liter transfer case capacity for the 2003-2007 model years, indicating no variation in transfer case size between the two engine variants.
  • Under normal use conditions, the transfer case fluid change interval for the B 3000 4WD is 150,000 miles, reflecting a long-drain schedule suited to less demanding operating environments.
  • Under severe use conditions, the B 3000 4WD transfer case fluid change interval drops to 60,000 miles, representing a 60% reduction compared to the normal-use interval of 150,000 miles.
  • The B 4000 4WD carries the same severe-use interval of 60,000 miles as the B 3000 4WD, with both configurations sharing identical interval structures across normal and severe conditions.
  • The 150,000-mile normal-use interval on the B 4000 4WD transfer case matches the B 3000 4WD exactly, meaning engine displacement does not influence the prescribed fluid change schedule in either use condition.

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