Mercedes-AMG SLK 55 R172
The last of the great naturally aspirated V8 compact roadsters.
- Power
- 421 bhp
- 0–60 mph
- 4.5 s
- Top speed
- 155 mph
- Est. value
- $16k–$52k
About the Mercedes-AMG SLK 55 R172
The R172-generation SLK 55 AMG represents the final chapter for the large-displacement, naturally aspirated V8 in Mercedes' compact roadster line. Its M152 engine is a unique derivative of the M157 biturbo, specifically engineered to be naturally aspirated for this application, featuring cylinder deactivation for improved efficiency. While it lacks the surgical precision of a contemporary Porsche Boxster, it offers a 'mini-SLS' aesthetic and a muscular, linear power delivery that is increasingly rare. As the last V8 SLK before the model was renamed SLC and downsized to a V6, it has become a sought-after modern classic for enthusiasts of old-school AMG character.
Mercedes-AMG SLK 55 R172 specs
The Mercedes-AMG SLK 55 R172 produces 421 bhp (314 kW) and 540 Nm (398 lb-ft) of torque. It reaches 60 mph in 4.5 seconds and has a top speed of 155 mph (250 km/h).
| Make | Mercedes-AMG |
|---|---|
| Model | SLK 55 |
| Generation | R172 |
| Trim | 5.5 V8 |
| Years | 2012–2015 |
| Type | Sports car |
| Body style | Roadster |
| Country | Germany |
| Production | About 3,500 built |
| Original price | About $68,000 when new |
| Engine | 5.5-litre naturally aspirated V8 |
|---|---|
| Displacement | 5,461 cc (5.5 litres) |
| Induction | Naturally aspirated |
| Power | 421 bhp (314 kW) at 6,800 rpm |
| Torque | 540 Nm (398 lb-ft) |
| Redline | 7,200 rpm |
| 0–60 mph | 4.5 s |
| Top speed | 155 mph (250 km/h) |
| Transmission | 7-speed automatic |
| Drivetrain | Rear-wheel drive |
| Weight | 1,610 kg (3,549 lb) |
| Power-to-weight | 261 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is a Mercedes-AMG SLK 55 R172 worth?
A typical Mercedes-AMG SLK 55 R172 is estimated to be worth $16,000 – $52,000 (about £12,000 – £39,000).
Its original price when new was about $68,000.
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
Mercedes-AMG SLK 55 R172 rarity in CarSpot
The Mercedes-AMG SLK 55 R172 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.
Mercedes-AMG SLK 55 R172 fun facts
- The M152 engine was the only naturally aspirated V8 in the AMG line-up during its production, as all other models had transitioned to turbocharging.
- It featured a Formula 1-inspired cylinder management system that could shut down four cylinders under light loads to improve fuel economy by up to 30 percent.
- The optional AMG Handling Package increased the electronically limited top speed from 155 mph to 174 mph (280 km/h).
