Porsche 928 (USA)
Differential fluid capacity & service interval
The Porsche 928 (USA) uses differential fluid with a capacity of 3 liters. The data covers 2 configurations of this model.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
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Additional Notes
- Both configurations listed share a 3-liter differential fluid capacity, which is a relatively substantial fill volume for a rear differential and reflects the transaxle-mounted unit design used in the Porsche 928 (USA).
- The note "from automatic" indicates the capacity figure applies specifically to a drain-and-refill procedure following an automatic transmission service, rather than a standalone differential overhaul measurement.
- The 928 (1986-1992) and the 928 GTS (1991-1995) carry identical 3-liter capacities despite representing different model variants, meaning no adjustment to fluid quantity is needed between the two configurations during a standard service fill.
- All listed entries are designated for normal use conditions, meaning the 3-liter service fill interval applies under standard operating circumstances rather than a severe-duty or first-change-only schedule.
- The 928 GTS variant, introduced in 1991, overlaps with the final years of the base 928 specification, yet both rows maintain the same capacity, indicating the GTS differential housing retained the same fluid volume as the earlier model.