The Opel R25 5-speed manual transmission was produced by the concern from 1986 to 2003 and was installed in rear-wheel drive models such as the first/second generation Omega and Senator. This transmission was installed with gasoline and diesel engines with torque up to 250 Nm.
Specifications
| Type | manual transmission |
| Number of gears | 5 |
| Type of drive | rear |
| Engine volume, l | up to 3.0 |
| Torque output, Nm | up to 250 |
| Recommended oil | API GL-4, SAE 75W-80 |
| Oil capacity, liter | 1.9 about 1.2 liters are required for replacement |
| Replacing the oil | every 60 000 km |
| Replacing the filter | every 60 000 km |
| Gearbox lifespan, km | ~350 000 km |
| Weight, kg | 65 |
Gear ratios Opel R25
Using the example of a 1990 Opel Omega with a 2.4 liter engine:
| Main | 3.45 |
| 1st | 3.954 |
| 2nd | 2.187 |
| 3rd | 1.387 |
| 4th | 1.000 |
| 5th | 0.845 |
| Reverse | 3.534 |
Using
The transmission was installed on:
- Opel Omega A (V87) in 1986 – 1994;
- Opel Omega B (V94) in 1994 – 2003;
- Opel Senator B (V88) in 1987 – 1993.
Disadvantages of the Opel R25 gearbox
- This is a reliable and durable manual transmission, but problems appear at high mileage;
- The most common complaint is about the loose lever, which breaks the bushings and plastic ring;
- Oil leaks directly through the gearshift seals are also quite common;
- Around 200,000 km, the input shaft bearing starts to hum and requires replacement;
- And active owners have relatively short-lived first-gear synchronizers.
