Mercedes-Benz
CLK
Owner report available
Mercedes-Benz
SLK
Owner report available
Mercedes-Benz CLK vs Mercedes-Benz SLK
The short answer
Based on available data, the Mercedes-Benz CLK comes out ahead of the Mercedes-Benz SLK on power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
CLK
Overall
Sentiment is mixed and heavily dependent on the specific generation, engine, and maintenance history. For the first-generation (W208, ~1997-2002) and second-generation (C209/A209, ~2003-2010) road cars, long-term owner reports indicate that well-maintained examples, particularly those with the M112 V6 or M113 V8 engines, are praised for their smooth power delivery, reliable powertrains, and elegant, timeless styling. However, there is a strong, recurrent consensus that these are not low-maintenance vehicles.
Best version to buy
Insufficient owner data available to declare a single "best" version. However, strong positive mentions are directed at models equipped with the M113 V8 engine (e.g., CLK500, CLK55 AMG) for its balance of power, smoothness, and noted reliability.
Known issues
- Rust corrosion on body panels (doors, trunk, fenders) and suspension components: very frequent on pre-facelift models, recurrent on later models.
- Aging interior electronics and actuators: includes failing AC vent motors (requiring dashboard removal), malfunctioning headlight leveling hydraulics, and general electrical gremlins. Frequency: recurrent.
- Suspension wear: multi-link systems with numerous bushings and ball joints wear out, leading to vague handling and noises, though the car may still drive smoothly. Replacement is costly. Frequency: recurrent.
SLK
Overall
Sentiment is mixed and heavily dependent on generation, specific engine, and ownership expectations. For the earliest R170 generation (1997-2004), owners report these as surprisingly reliable and robust budget-friendly classic convertibles when purchased cheaply (e.g., £1,000 GBP / ~$1,260 USD), praised for their bulletproof engines, comfortable heated seats, and effective "Airscarf" neck heating system. The hardtop convertible mechanism is generally seen as a durable asset, though its seals require regular lubrication.
Best version to buy
Insufficient owner data available to declare a definitive "best" version. Isolated positive remarks exist for the R170 for its simplicity and value, and for the R172 SLK55 AMG for its powerful V8 engine.
Known issues
- Hydraulic convertible top failure (R171): roof operation slows, makes loud noises, leaks hydraulic fluid (causing skin irritation), eventually fails completely; repair cost often cited as exceeding vehicle value. Frequency: recurrent.
- Engine timing chain/balance shaft issues (R171 M272 V6): timing chain noise, potential for catastrophic failure due to faulty balance shaft gears on 2004-2007 models. Frequency: recurrent.
- Electrical faults and sensor failures: various error codes for oxygen sensors, air pumps, camshaft timing sensors, power steering pressure valves, and other components; can cause rough running or warning lights. Frequency: recurrent.
The verdict
The Mercedes-Benz SLK is the better choice for most buyers.
It has stronger reliability sentiment in owner reports than the Mercedes-Benz CLK, based on the data above. If the specific known issues on the Mercedes-Benz SLK are a dealbreaker, the Mercedes-Benz CLK is worth a closer look instead.
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Common problems by model year
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Frequently asked questions
Which is more reliable, the Mercedes-Benz CLK or the Mercedes-Benz SLK?
Owner reports lean more positive on reliability for the Mercedes-Benz SLK than the Mercedes-Benz CLK. See the known issues comparison above for the specific concerns owners report on each.
Which is better for families, the Mercedes-Benz CLK or the Mercedes-Benz SLK?
The Mercedes-Benz CLK seats more passengers than the Mercedes-Benz SLK on its catalogued best-equipped version. Body type also differs: the Mercedes-Benz CLK is classed as a Cabriolet, the Mercedes-Benz SLK as a Roadster.
Which has better fuel economy, the Mercedes-Benz CLK or the Mercedes-Benz SLK?
The EPA rates the 2009 Mercedes-Benz CLK at 17–20 mpg combined and the 2016 Mercedes-Benz SLK at 22–27 mpg, depending on the version.
Which is cheaper to maintain, the Mercedes-Benz CLK or the Mercedes-Benz SLK?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Mercedes-Benz CLK than the Mercedes-Benz SLK. See the known issues comparison above.