Opel Diplomat B
The German executive express with a Corvette heart.
- Power
- 230 bhp
- 0–60 mph
- 8.1 s
- Top speed
- 127 mph
- Est. value
- $18k–$45k
About the Opel Diplomat B
The Diplomat B was the flagship of Opel's 'KAD' range, designed to compete with the Mercedes-Benz S-Class using American muscle and European refinement. It featured a sophisticated De Dion rear suspension and a Chevrolet-sourced 327 cubic-inch V8, providing effortless torque and high-speed cruising stability. Despite its technical excellence and understated luxury, it struggled to overcome the prestige of its domestic rivals, making it a rare and distinctive choice for modern collectors. The V8 models are particularly prized for their smooth power delivery and robust GM-sourced drivetrains.
Opel Diplomat B specs
The Opel Diplomat B produces 230 bhp (172 kW) and 427 Nm (315 lb-ft) of torque. It reaches 60 mph in 8.1 seconds and has a top speed of 127 mph (205 km/h).
| Make | Opel |
|---|---|
| Model | Diplomat |
| Generation | B |
| Trim | 5.4 V8 |
| Years | 1969–1977 |
| Type | Luxury |
| Body style | Saloon |
| Country | Germany |
| Production | About 21,021 built |
| Engine | 5.4-litre V8 |
|---|---|
| Displacement | 5,354 cc (5.4 litres) |
| Induction | Naturally aspirated |
| Power | 230 bhp (172 kW) at 4,700 rpm |
| Torque | 427 Nm (315 lb-ft) |
| Redline | 5,100 rpm |
| 0–60 mph | 8.1 s |
| Top speed | 127 mph (205 km/h) |
| Transmission | 3-speed automatic |
| Drivetrain | Rear-wheel drive |
| Weight | 1,690 kg (3,726 lb) |
| Power-to-weight | 136 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is an Opel Diplomat B worth?
A typical Opel Diplomat B is estimated to be worth $18,000 – $45,000 (about £13,000 – £34,000).
Values are directional estimates for a typical example, not appraisals. Condition, mileage, history and specification all change what a real car is worth. Pound figures use the exchange rate of 3 November 2026. How values are estimated
Opel Diplomat B rarity in CarSpot
The Opel Diplomat B is a Rare card in CarSpot, with a rarity score of 42 out of 100. Performance cars, typically worth around £50,000 to £100,000. A Rare card is worth 40 XP.
Each model's tier starts from a 0–100 score based on its value plus its power or production numbers. Once enough players have spotted a model, how often it is spotted can move it up or down one tier. How CarSpot rarity works
Rarity is a collectible game mechanic, not an assessment of real-world scarcity or value.
Opel Diplomat B fun facts
- The 5.4-litre V8 engine was essentially a Chevrolet Corvette small-block, but specially balanced and blueprinted for smoother operation in a luxury saloon.
- It was the first German car to feature a De Dion rear axle, a sophisticated setup that provided superior handling compared to the live axles of its predecessors.
- Four special convertible versions were built by Fissore and Karmann for VIP transport and parade duties.