Hummer H1 (USA / CAN)
Automatic transmission fluid capacity & service interval
Hummer H1 (USA / CAN) automatic transmission fluid capacity ranges from 7,3 to 12,8 liters. Service intervals occur every 12000 miles. The data covers 2 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| H1 6.5TD (1996-2004) |
|
| H1 6.5D (1994-2004) |
|
Additional Notes
- The Hummer H1 automatic transmission carries a dry fill capacity of 12.8 liters, a figure that reflects the total fluid volume required when filling a completely drained or rebuilt unit, including the torque converter and all internal passages.
- The service fill capacity of 7.3 liters is notably lower than the dry fill, representing only the fluid displaced during a routine drain, since a portion remains trapped in the torque converter and valve body during a standard service procedure.
- The gap between the 12.8-liter dry fill and the 7.3-liter service fill amounts to roughly 5.5 liters of retained fluid, which underscores why overfilling is a real risk if a technician applies dry fill quantities during a routine service.
- Both the 6.5D naturally aspirated and the 6.5TD turbocharged configurations share identical automatic transmission fluid capacities of 12.8 liters dry and 7.3 liters service fill, indicating the same transmission unit was used across both engine variants.
- The 6.5D engine application covers model years 1994-2004, while the 6.5TD turbocharged variant enters the specification set from 1996-2004, meaning the turbocharged configuration has a narrower model year range within the same transmission specification framework.
- A change interval of 12,000 miles applies to both configurations under normal use conditions, placing automatic transmission fluid changes on a moderately frequent schedule relative to many passenger vehicles of the same era.