Porsche 928 (USA)
Automatic transmission fluid capacity & service interval
Porsche 928 (USA) automatic transmission fluid capacity ranges from 7,3 to 9,3 liters. The data covers 2 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| 928 GTS (1991-1995) |
|
| 928 (1986-1992) |
|
Additional Notes
- The Porsche 928 (USA) automatic transaxle carries a dry fill capacity of 9.3 liters, which represents the total fluid volume required when filling a completely empty or overhauled unit from scratch.
- The service fill capacity of 7.3 liters is the amount used during a routine fluid change, reflecting the volume that remains in the torque converter and passages even after draining.
- The 2.0-liter difference between the dry fill and service fill figures means roughly 22% of the total fluid volume is retained in the transmission assembly during a standard drain-and-fill service.
- The 928 (1986-1992) and the 928 GTS (1991-1995) share identical automatic transaxle capacities, with both the 9.3-liter dry fill and 7.3-liter service fill values applying equally across both configurations.
- Both configurations carry a normal use condition designation, meaning the listed capacities apply under standard operating conditions rather than a severe-duty or first-change-only scenario.