Isuzu H series (USA / CAN)

Coolant capacity & service interval

Isuzu H series (USA / CAN) coolant capacity ranges from 29,9 to 34 liters. Service intervals include checks at 7500 miles or 3 months and changes at 150000 miles or 60 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)
  • Use: Normal
  • Capacity 32,9 liter (with automatic transmission)
  • Capacity 31 liter (with manual transmission)
  • Capacity 34 liter (with manual transmission, A/C and increased cooling)
  • Check 7500 miles/ 3 months
  • Change 150000 miles/ 60 months
H series (2003-2006)
  • Use: Normal
  • Capacity 31,9 liter (with automatic transmission)
  • Capacity 29,9 liter (with manual transmission)
  • Capacity 33,4 liter (with manual transmission, A/C and increased cooling)
  • Check 7500 miles/ 3 months
  • Change 150000 miles/ 60 months

Additional Notes

  • The Isuzu H series (USA / CAN) cooling system capacity varies depending on transmission type, with the 2003-2006 configuration holding 31.9 liters with an automatic transmission and 29.9 liters with a manual transmission.
  • The largest coolant capacity in the 2003-2006 model years applies to manual transmission vehicles equipped with air conditioning and an increased cooling package, reaching 33.4 liters.
  • The 2007-2008 H series shows a slight increase across all three transmission and equipment configurations compared to 2003-2006, with the automatic transmission variant holding 32.9 liters, the manual transmission variant holding 31 liters, and the manual transmission with A/C and increased cooling variant holding 34 liters.
  • The coolant check interval for both the 2003-2006 and 2007-2008 H series is set at 7,500 miles or 3 months under normal use conditions, whichever comes first.
  • The coolant change interval for both year ranges is 150,000 miles or 60 months under normal use conditions, a notably long service life that reflects the extended-life coolant formulations typically specified for heavy-duty commercial vehicles of this era.
  • The difference in capacity between the manual transmission base configuration and the manual transmission with A/C and increased cooling configuration is 3.5 liters in the 2003-2006 range and 3 liters in the 2007-2008 range, reflecting the additional volume required by the expanded cooling circuit.

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