Opel Admiral
Differential fluid capacity & service interval
Opel Admiral differential fluid capacity ranges from 1,3 to 1,4 liters. Service intervals consist of 10000 km or 6 months. The data covers 8 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
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Additional Notes
- The Opel Admiral 2.6 (1964-1966) and Admiral 2.8 (1966-1968) share an identical rear differential fluid capacity of 1.4 liters, indicating the same rear axle housing was carried across both engine variants during those years.
- Starting with the 1969-1977 generation, all Admiral 2.8 variants — the E, H, and S — use a reduced rear differential capacity of 1.3 liters, down from the 1.4 liters specified for the earlier 2.6 and 2.8 models.
- The 1964-1968 models specify a check interval of 10,000 km with no time-based condition attached, while all 1969-1977 variants add a 6-month time limit alongside the same 10,000 km distance, meaning whichever threshold is reached first would trigger a service check.
- The 1.3-liter capacity on the 1969-1977 models applies equally to both the standard rear differential and the limited slip differential variant, so the presence of a limited slip unit does not alter the fluid volume requirement.
- A capacity figure in this context represents a service fill level — the amount of fluid needed to bring the differential to its correct operating level — rather than a full overhaul or flush volume, which would typically be higher to account for residual fluid displacement.
- The Admiral 2.8 E, 2.8 H, and 2.8 S all share the same 1.3-liter capacity and 10,000 km / 6-month check interval for both differential configurations, meaning the trim designation does not introduce any variation in rear differential service specifications within the 1969-1977 generation.