Isuzu H series (USA / CAN)

Differential fluid capacity & service interval

Isuzu H series (USA / CAN) differential fluid capacity ranges from 13,7 to 16,1 liters. Service intervals include checking every 7500 miles or 3 months and changing every 100000 miles or 12 months. The data covers 2 configurations.

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

TypeSpecifications
  • H series (2007-2008)
  • Rear, tandem
  • Use: Normal
  • Capacity 14,7-16,1 liter (HPI)
  • Capacity 15,1 liter (HPE, HPJ)
  • Capacity 13,7 liter (HP3)
  • Check 7500 miles/ 3 months
  • Change 100000 miles/ 12 months
  • H series (2003-2006)
  • Rear, tandem
  • Use: Normal
  • Capacity 14,7-16,1 liter (HPI)
  • Capacity 15,1 liter (HPE, HPJ)
  • Capacity 13,7 liter (HP3)
  • Check 7500 miles/ 3 months
  • Change 100000 miles/ 12 months

Additional Notes

  • The Isuzu H series (USA / CAN) rear tandem differential carries notably large fluid capacities, with the HPI configuration holding between 14.7 and 16.1 liters, reflecting the substantial volume typical of heavy-duty tandem axle assemblies.
  • HPE and HPJ configurations share a fixed capacity of 15.1 liters for the rear tandem differential, while the HP3 configuration holds a comparatively smaller 13.7 liters.
  • The 14.7–16.1 liter range listed for the HPI configuration suggests a service fill variance, where the actual volume accepted depends on the specific axle ratio or housing variant within that engine family.
  • Under normal use conditions, the rear tandem differential fluid on 2003-2006 models is subject to a check interval of every 7,500 miles or 3 months, whichever comes first.
  • The change interval under normal use conditions is set at 100,000 miles or 12 months, applying to all configurations across the 2003-2006 model years.
  • The 2007-2008 H series retains identical capacity figures across all configurations — HPI at 14.7–16.1 liters, HPE and HPJ at 15.1 liters, and HP3 at 13.7 liters — with no deviation from the earlier model year specifications.
  • The check and change intervals for the 2007-2008 rear tandem differential under normal use conditions remain unchanged at 7,500 miles or 3 months for checks, and 100,000 miles or 12 months for fluid changes.

Other Systems