1994-1999 Opel Omega B 2.5 TD (131 Hp)

The Opel Omega B 2.5 TD, producing 131 horsepower, was a variant of the Omega B model manufactured between January 1994 and July 1999. Positioned as a mid-range offering within the Omega B lineup, it provided a balance between performance and fuel economy, appealing to drivers seeking a comfortable and capable long-distance cruiser. The Omega B itself was a significant model for Opel, built on the GM Epsilon platform (internally designated as 1HX0/A3), representing a substantial upgrade over its predecessor in terms of refinement, technology, and safety.

The 2.5 TD variant was powered by a 2.5-liter inline-six cylinder diesel engine, designated with engine codes 25DT and X25DT. This engine utilized a precombustion chamber injection system, a common diesel technology of the era, which involved injecting fuel into a small pre-chamber before the main combustion chamber to improve mixing and combustion efficiency. A turbocharger with an intercooler was employed to increase power output. The engine featured a double overhead camshaft (DOHC) valvetrain with two valves per cylinder. The engine’s 22:1 compression ratio was typical for diesel engines of the time. The engine required 6.5 liters (6.87 US quarts) of oil meeting specific Opel specifications, and the cooling system held 10.2 liters (10.78 US quarts) of coolant.

In real-world driving, the 2.5 TD Omega B offered respectable performance for its time. Acceleration from 0 to 100 km/h (0-62 mph) took approximately 12 seconds, while 0-60 mph was achieved in around 11.4 seconds. The engine produced 250 Nm (184.39 lb-ft) of torque at 2200 rpm, providing good pulling power for overtaking and highway cruising. While not as quick as the gasoline-powered variants, the diesel offered significantly better fuel economy. The five-speed manual transmission was standard, providing a direct connection to the engine’s power. The gear ratios were tuned for relaxed cruising, prioritizing fuel efficiency over outright acceleration.

The 2.5 TD Omega B typically came equipped with a reasonable level of standard features. Interior upholstery was generally cloth, though leather was available as an option. The dashboard layout was functional and straightforward, with clear instrumentation. Standard equipment included power windows, central locking, and an anti-lock braking system (ABS). Optional extras included air conditioning, a sunroof, and upgraded audio systems. The Omega B was known for its spacious interior, offering comfortable seating for five adults and a generous trunk capacity ranging from 530 to 830 liters (18.72 to 29.31 cubic feet) depending on the rear seat configuration.

The Omega B 2.5 TD featured a coil spring suspension system at both the front and rear, providing a comfortable ride quality. Front brakes were ventilated discs, while rear brakes were solid discs. The car’s kerb weight of 1605 kg (3538.42 lbs) contributed to its stable handling characteristics. Steering was hydraulic power-assisted, providing a light and responsive feel. The standard tire size was 205/65 R15, mounted on 6.5J x 15 inch wheel rims. The drag coefficient of 0.28 was respectable for a sedan of its size and era, contributing to improved fuel efficiency.

Contemporary reviews of the Opel Omega B 2.5 TD generally praised its comfortable ride, spacious interior, and fuel efficiency. Critics noted that the diesel engine, while capable, lacked the refinement and responsiveness of the gasoline engines. However, the 2.5 TD offered a compelling value proposition for drivers prioritizing practicality and economy. Compared to the 2.0-liter gasoline variants, the 2.5 TD delivered significantly better fuel economy (around 8 l/100 km combined) but slightly slower acceleration. The 2.5 TD was also considered more reliable than some of the more complex gasoline engines in the Omega B range.

Today, the Opel Omega B 2.5 TD is a relatively rare sight on the roads. When well-maintained, the 25DT engine is known for its durability and longevity. However, as with any older diesel engine, potential buyers should be aware of possible issues with the fuel injection system and turbocharger. Parts availability can be a challenge, but a dedicated community of Omega B enthusiasts exists, providing support and resources for owners. The 2.5 TD variant remains a viable option for those seeking a classic, comfortable, and economical long-distance cruiser.