Photo: Wikimedia Commons (CC)
Every generation
Power
0–62 mph (0–100 km/h)
Top speed (250 km/h)
Combined, EPA 2016
What owners say
Our take, from owner reports
Sentiment is mixed and heavily dependent on generation, specific engine, and ownership expectations.
7 problems reported (3 recurrent, 4 isolated) · medium confidence
Problems owners report
- RecurrentHydraulic 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.
- RecurrentEngine 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.
- RecurrentElectrical 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.
+ 4 more issuesShow fewer
- IsolatedABS system malfunctions
ABS warning light illumination with grinding/pulsing sensations through brake pedal; can be intermittent and difficult to diagnose.
- IsolatedRoof seal degradation and noise
Seals become dry and squeaky/creaky without regular lubrication.
- IsolatedIntermittent starting/immobilizer issues (R170)
Failure to crank or start, related to immobilizer control unit wiring under the dashboard.
- IsolatedRear subframe corrosion (R170)
Known corrosion point, sometimes covered under a 30-year anti-corrosion warranty from Mercedes.
The version owners recommend
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. The R171 generation, particularly pre-2008 V6 models, is associated with the most significant mechanical concerns.
Competitors to consider
Owners compare it most often with the Mazda MX-5 Miata, Porsche Boxster, Lexus SC430, Lexus IS and BMW Z4.
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Overall sentiment
Sentiment is mixed and heavily dependent on generation, specific engine, and ownership expectations. The hardtop convertible mechanism is generally seen as a durable asset, though its seals require regular lubrication. The R171 generation (2004-2011) receives more critical feedback, with significant and recurrent concerns about complex and expensive hydraulic roof failures, potential engine issues (specifically balance shaft problems on 2004-2007 V6 models), and various electrical gremlins. The R172 generation (2011-2016) is mentioned less frequently, with some noting it as a more modern and reliable evolution. Across all generations, the SLK is consistently described as a comfortable, refined cruiser rather than an exciting driver's car, with powertrains (particularly the base 4-cylinder and 5-speed automatic) deemed adequate for gentle cruising but not engaging. Satisfaction is highest among owners who acquire older models at low cost with realistic maintenance expectations.
Positioning vs competitors
Positioned as a more refined, comfortable, and feature-luxurious cruiser compared to the engaging, driver-focused Mazda MX-5 Miata. The hardtop is seen as a practical advantage over fabric-top rivals. Compared to the Porsche Boxster, the SLK is viewed as less sporty and engaging but potentially more reliable as a cheap used car. The Lexus SC430 is mentioned as a more powerful, comfortable, reliable, and roomier alternative, though less nimble. The SLK is often seen as a "poor man's SL-Class" or a more compact, affordable counterpart to the Mercedes CLK coupe/convertible.
Recommended configurations
Insufficient owner data for specific configuration recommendations. Isolated advice includes: using Gummi Pflege lubricant on roof seals regularly; checking for and addressing rear subframe corrosion on R170 models; preferring post-2008 V6 models (R171) to avoid potential balance shaft issues; and considering the hardtop a valuable feature for durability.
General recommendations
Suitable as a second car or weekend cruiser for owners with realistic expectations about maintenance costs and driving dynamics. Best purchased at a low price point with a significant budget reserved for repairs, especially for R171 models. Not recommended as a primary, reliable daily driver without mechanical aptitude or a willingness to pay for specialist repairs. Essential to conduct a thorough pre-purchase inspection focusing on roof mechanism operation, engine health (listening for timing chain/balance shaft noise), and checking for stored fault codes. For R170 models, verify operation of the roof microswitches and check for rear subframe corrosion. Ownership satisfaction is closely tied to purchase price and DIY repair capability.
Remarks
The provided data spans multiple generations (R170, R171, R172) and a wide range of model years (1997-2016), making unified conclusions difficult. Much of the critical feedback centers on the R171 generation, particularly its complex roof and the M272 V6 engine's known weaknesses. Positive remarks for the R170 highlight its value and durability when maintained, suggesting a bifurcated reputation based on age and complexity. The high cost of dealership repairs for issues like the hydraulic roof is a major theme, pushing owners towards independent specialists or DIY fixes. Analysis based on approximately 30 substantive owner discussions and problem reports.
Generation by generation
Owner insights per generation and US complaint/recall records (NHTSA).
Complaints and recalls by model yearWorst year: 2002. Years to avoid: 2007, 2006, 2005, 2002Source: NHTSA (US)Show table
Each year graded against the model's other years: Year Score. See all Mercedes-Benz SLK years to avoid
| Year | Complaints | Recalls | Most-reported area |
|---|---|---|---|
| 2016 | 2 | 0 | unknown or other |
| 2015 | 4 | 0 | fuel/propulsion system |
| 2014 | 3 | 0 | structure |
| 2013 | 9 | 0 | structure |
| 2012 | 12 | 0 | fuel/propulsion system |
| 2009 | 3 | 0 | steering |
| 2008 | 14 | 0 | air bags |
| 2007 | 37 | 0 | air bags |
| 2006 | 34 | 0 | power train |
| 2005 | 27 | 0 | power train |
| 2004 | 7 | 0 | exterior lighting |
| 2003 | 20 | 0 | exterior lighting |
| 2002 | 53 | 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: R172
AMG SLK 55 V8 PLUS
5.5L 8-cylinder · 421 hp · RWD · automatic
Built 2012–2015