Opel Commodore C
Automatic transmission fluid capacity & service interval
Opel Commodore C requires automatic transmission fluid with a capacity of 2,5 liters. Service intervals include 40000 km or 24 months, as well as 20000 km. The data covers 4 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Commodore 2.5 E (1977-1982) |
|
| Commodore 2.5 E (1977-1982) |
|
| Commodore 2.5 S (1977-1982) |
|
| Commodore 2.5 S (1977-1982) |
|
Additional Notes
- The Opel Commodore C automatic transmission fluid capacity is 2.5 liters across all listed variants, covering both the 2.5 E and 2.5 S engine configurations for the 1977-1982 model years.
- A 2.5-liter automatic transmission fill is a relatively modest capacity, consistent with the compact gearbox designs commonly paired with inline-four and inline-six engines of that era.
- Under normal use conditions, the 2.5 E and 2.5 S both share an identical service interval of 40,000 km or 24 months, whichever comes first, meaning time elapsed can trigger a fluid change even before the mileage threshold is reached.
- Under severe use conditions, the change interval for both the 2.5 E and 2.5 S drops to 20,000 km, which is exactly half the normal-use mileage interval, reflecting the greater thermal and mechanical stress placed on automatic transmission fluid in demanding operating environments.
- The severe-use interval of 20,000 km carries no time-based component, unlike the normal-use interval, which specifies both a distance and a 24-month ceiling.
- The 2.5 E and 2.5 S variants show no difference in fluid capacity or service intervals, with both trims specifying 2.5 liters and identical change schedules under both normal and severe conditions across the full 1977-1982 span.