Opel Diplomat B
Power steering fluid capacity & service interval
The Opel Diplomat B uses power steering fluid with a capacity ranging from 1.1 to 1.2 liters depending on the configuration. Four configurations are covered in the data.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Diplomat B 2.8 E (1969-1977) |
|
| Diplomat B 2.8 HC (1969-1977) |
|
| Diplomat B 2.8 S (1969-1977) |
|
| Diplomat B V8 (1969-1977) |
|
Additional Notes
- The Opel Diplomat B power steering system holds 1.2 liters across the 2.8 E, 2.8 HC, and 2.8 S variants for the 1969-1977 model years under normal use conditions.
- The Diplomat B V8 carries a slightly lower power steering fluid capacity of 1.1 liters, also specified under normal use conditions for the 1969-1977 period.
- A capacity figure for a power steering system typically reflects the total fluid volume held within the reservoir, pump, and steering gear combined, representing a full service fill rather than a partial top-up quantity.
- The 0.1-liter difference between the six-cylinder variants at 1.2 liters and the V8 at 1.1 liters indicates a measurable variation in system volume tied directly to engine configuration rather than model year or trim level.
- All four configurations share a normal use condition designation, meaning the stated capacities apply to standard operating environments without adjustment for severe or demanding driving conditions.