Photo: Wikimedia Commons (CC)
Every generation
Power
0–62 mph (0–100 km/h)
Top speed (300 km/h)
Combined, EPA 2009
What owners say
Our take, from owner reports
Sentiment is mixed and heavily dependent on the specific generation, engine, and maintenance history.
7 problems reported (1 very frequent, 4 recurrent, 1 isolated) · medium confidence
Problems owners report
- Very frequentNeglected maintenance
Leading to major failures; includes ignored transmission fluid, coolant, brake fluid, and spark plug intervals.
- RecurrentAging interior electronics and actuators
Includes failing AC vent motors (requiring dashboard removal), malfunctioning headlight leveling hydraulics, and general electrical gremlins.
- RecurrentSuspension 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.
+ 4 more issuesShow fewer
- RecurrentEngine-specific faults
M112/M113 V6/V8: potential for valve cover and PCV box leaks, rear main seal leaks (expensive). M272 V6 (post-2004): potential balance shaft defect (very expensive) and variable intake manifold failures. M271 Kompressor 4-cylinder: faulty timing chains.
- RecurrentAutomatic transmission concerns
5-speed automatic generally robust but can develop conductor plate issues; 7G-Tronic (7-speed) has a known design defect with the transmission pump that can lead to failure. Fluid neglect is a major risk.
- IsolatedConvertible roof mechanism failures
Electro-hydraulic system repairs are expensive.
- Rust corrosion on body panels (doors, trunk, fenders) and suspension components
Very frequent on pre-facelift models, recurrent on later models.
The version owners recommend
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. The M112 V6 (e.g., CLK320) is also frequently praised for its reliability and smooth operation. There is a suggestion that facelift models (post-2005 for the C209) may have better rust protection. The CLK55 AMG is specifically mentioned as a desirable performance variant.
Competitors to consider
Owners compare it most often with the BMW 3-Series (E46, E90), Mercedes-Benz E-Class (W211), Mercedes-Benz C-Class (W203), Mercedes-Benz SLK and BMW 435i Coupe.
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Overall sentiment
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. Neglect leads to expensive repairs, and even with care, owners report facing age-related issues with electronics, suspension components, and body rust. The convertible variants (A209) are noted for potentially expensive electro-hydraulic roof mechanisms. The sentiment shifts dramatically for the CLK GTR, a homologated race car from the late 1990s, which is universally revered in community discussions as an iconic, dominant, and beautiful motorsport legend, though it is not considered in the context of daily ownership.
Positioning vs competitors
Positioned as a stylish, more affordable alternative to the flagship Mercedes-Benz SL roadster, described by some as a "poor man's SL." Compared to contemporary BMW 3-Series coupes, it is often viewed as more refined, comfortable, and elegant but less sporty and engaging for driving enthusiasts. Within the Mercedes lineup, it was seen as a coupe version of the C-Class (W203) but with styling cues and features from the E-Class and S-Class. The CLK55 AMG was competitively reviewed against contemporary performance coupes. Later models are seen as precursors to the current CLE.
Recommended configurations
Insufficient specific configuration data from owner discussions. General advice inferred from maintenance discussions includes: prioritizing a full service history, opting for the M112 V6 or M113 V8 engines for reliability, thoroughly inspecting for rust (especially on pre-facelift models and suspension components), and having a specialist pre-purchase inspection for any model. For convertibles, a full test of the vario-roof mechanism is essential.
General recommendations
Only recommended for buyers who are mechanically inclined or financially prepared for ongoing maintenance and repairs. Not suitable as a sole, low-budget daily driver for those unwilling to DIY. Essential to purchase based on condition and maintenance history, not mileage or price alone. A comprehensive pre-purchase inspection by a Mercedes specialist is non-negotiable, focusing on engine health (checking for leaks, carbon buildup on direct injection models, balance shaft issues on early M272 V6s), transmission operation, suspension wear, and pervasive rust. Verify the service history includes regular fluid changes (engine oil, transmission, brake, coolant). For older, neglected examples (e.g., a 2000 model), the cost of deferred maintenance will likely exceed the car's value.
Remarks
The CLK's reputation is bifurcated between its celebrated racing derivative (the CLK GTR) and the road cars, which are seen as typical of early-2000s German luxury: rewarding when sorted but punishing when neglected. The M112 and M113 engines are consistently highlighted as high points for durability. There is a noted generational shift in build quality, with facelift models (approximately mid-2005 onward) believed to have improved anti-corrosion treatments, making them potentially better long-term ownership prospects. Much of the negative reliability perception stems from high repair costs at dealerships and owners deferring maintenance on complex systems. Analysis based on approximately 24 substantive owner discussions and inquiries.
Generation by generation
Owner insights per generation and US complaint/recall records (NHTSA).
Complaints and recalls by model yearNo year grades F. Best year: 2009Source: NHTSA (US)Show table
Each year graded against the model's other years: Year Score.
| Year | Complaints | Recalls | Most-reported area |
|---|---|---|---|
| 2009 | 9 | 0 | visibility |
| 2008 | 20 | 0 | fuel/propulsion system |
| 2007 | 53 | 0 | fuel/propulsion system |
| 2006 | 48 | 0 | fuel/propulsion system |
| 2005 | 33 | 0 | electrical system |
| 2004 | 38 | 0 | seat belts |
| 2003 | 33 | 0 | electrical system |
| 2002 | 34 | 0 | electrical system |
Complaint counts come from owner reports filed with the US National Highway Traffic Safety Administration. Higher-selling years naturally accumulate more complaints.
Specifications
Enthusiast code: C209
AMG CLK 63 Black Series V8 AMG
6.2L 8-cylinder · 507 hp · RWD · automatic
Built 2007–2009