Mercedes SLK R171 Common Problems

The Mercedes SLK R171 is a stylish roadster that blends luxury with performance. However, like any vehicle, it has its set of quirks and issues. For potential buyers or current owners, it’s always wise to be informed about what problems might arise and the likely solutions.

Engine Concerns

Early SLK 350 models, particularly those from 2004-2007, have raised concerns regarding their engines.

The Balance Shaft Issue:

• Identification: A significant number of early 3.5-litre engines, possibly extending to late 2007 or early 2008 models, have encountered balance shaft problems.
• Solution: Rather than focusing solely on the manufacturing year, it’s recommended to check the engine numbers to identify affected units.
• Cost: If the balance shaft issue arises, a decent independent Mercedes specialist may charge between £2,000 to £2,500 for a proper fix.
• Additional Point: It’s essential to consider the road tax implications based on the manufacturing year. Cars manufactured pre-April 2006 have a lower road tax, whereas those made post-April 2006 might attract £540 per year.

Excessive Oil Consumption:

• Identification: Some 2005 models have warnings for excessive oil consumption, although many owners haven’t encountered this problem, even after clocking over 90,000 miles.

Key Takeaway:

Later models, especially the 171 phase 2, come equipped with engine modifications, offering 305 hp and falling within a more economical tax bracket.

Structural Vulnerabilities

• Rust: Despite the car’s underside being predominantly covered by plastic, the rear arches can be particularly susceptible to rust.
• Plastic Coverings: Over time, these protective layers might need a check-up or replacement to ensure the car’s integrity.

Interior and Comfort

• Electric Seats: An innovative feature where the seats move back to aid ingress and egress. However, if improperly set, the seat back might hit the rear, causing damage. The resultant damage could manifest as an annoying rattle.
• Seat Heaters: The bottom seat heater might get impaired if someone kneels on the seat. It’s vital to ensure gentle treatment of the interior features to avoid such damages.
• Air Scarf: A must-have feature for those who love the open-top drive experience all year round. It’s designed to ensure comfort during colder conditions.
• Perspex Windscreen: An expensive but worthy addition. This screen, located behind the headrests, combats wind buffeting, enhancing the driving experience.

Electrical and Electronics

• Air Conditioning: In some units, a fuse box in the engine bay might suffer water damage leading to corrosion. This corrosion might cause the air conditioning to operate intermittently.
• Xenon Unit: While largely reliable, there have been instances where the Xenon unit needed replacement.

Conclusion

While the Mercedes SLK R171 is a fantastic blend of elegance and power, being informed about its potential problems is crucial for longevity. Regular checks, maintenance, and a keen eye for any anomalies can help ensure that the car remains a joy to drive and own for years to come. Remember, every car has its set of quirks, and understanding them is the key to a happy ownership experience.