BMC Megastar

Differential fluid capacity & service interval

BMC Megastar differential fluid capacity is 3,2 liters. Service intervals include checks every 10000 km or 6 months and changes every 60000 km or 12 months. The data covers 4 configurations.

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

TypeSpecifications
  • Megastar 290 (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 3,2 liter
  • Check 10000 km/ 6 months
  • Change 60000 km/ 12 months
  • Code: BMC 135T
  • Megastar 310 (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 3,2 liter
  • Check 10000 km/ 6 months
  • Change 60000 km/ 12 months
  • Code: BMC 135T
  • Megastar 360 (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 3,2 liter
  • Check 10000 km/ 6 months
  • Change 60000 km/ 12 months
  • Code: BMC 142T
  • Megastar 400 (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 3,2 liter
  • Check 10000 km/ 6 months
  • Change 60000 km/ 12 months
  • Code: BMC 142T

Additional Notes

  • The BMC Megastar rear differential holds 3.2 liters across all four variants — the 290, 310, 360, and 400 — covering the 2005-2011 model years. A consistent capacity across different engine ratings in a heavy commercial vehicle typically reflects a shared axle assembly rather than variant-specific hardware.
  • The check interval for the rear differential fluid is set at 10,000 km or 6 months, whichever comes first, under normal use conditions. In differential service, periodic checks at shorter intervals than the full drain cycle allow for early detection of fluid contamination or level loss without requiring a complete fluid change.
  • The fluid change interval is specified at 60,000 km or 12 months under normal use conditions. The time-based component of 12 months acknowledges that differential fluid degrades through oxidation and moisture absorption over time, independent of mileage accumulation.
  • The ratio between the check interval and the change interval is 1:6 by distance, meaning the fluid level and condition are inspected six times before a full drain and refill is due. This staged approach is common in heavy truck differentials, where fluid integrity directly affects gear and bearing longevity under load.
  • All four Megastar variants — 290, 310, 360, and 400 — share identical check and change intervals alongside the same 3.2-liter capacity. The numeric designations in the variant names correspond to engine output ratings, yet the rear differential specifications remain uniform across the range for the 2005-2011 period.

Other Systems