Opel Diplomat A
Power steering fluid capacity & service interval
Opel Diplomat A power steering fluid capacity ranges from 0.6 to 1.2 liters depending on configuration. The data covers three configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Diplomat A 5.4 V8 (1965-1968) |
|
| Diplomat A 2.8 HL (1964-1968) |
|
| Diplomat A 4.6 V8 (1964-1968) |
|
Additional Notes
- The Opel Diplomat A 2.8 HL carries a power steering fluid capacity of 1.2 liters, the largest figure among the three engine variants listed for the 1964-1968 model range.
- The 4.6 V8 variant holds a notably smaller capacity of 0.6 liters, which is half the volume specified for the 2.8 HL despite both sharing the same 1964-1968 production span.
- The 5.4 V8, available from 1965-1968, sits between the other two at 1.1 liters, indicating a different power steering system configuration than the smaller-displacement V8.
- All three variants carry normal-use designations for their respective capacity figures, meaning the stated volumes apply to standard operating conditions rather than severe-duty or first-fill scenarios.
- The 0.6-liter capacity of the 4.6 V8 is a relatively modest reservoir volume, consistent with a compact or integrated power steering unit rather than a larger remote-reservoir arrangement.
- The 0.5-liter difference between the 5.4 V8 and the 4.6 V8 reflects a meaningful divergence in system size between two engines that otherwise share the same V8 configuration and largely overlapping production years.