2011 Mercedes-Benz SL550

The 2011 Mercedes-Benz SL550 is a luxury roadster known for its retractable hardtop, powerful engine, and comfortable ride. The 2011 SL550 is equipped with a 5.5L naturally aspirated V8 engine producing 382 horsepower and 391 lb-ft of torque, paired with a 7-speed automatic transmission. While the SL550 offers a blend of performance and luxury, some owners have reported experiencing specific issues over time. Owners appreciate the powerful engine, comfortable ride, and the convenience of the retractable hardtop. Some common complaints include high maintenance costs, electrical issues, and occasional problems with the hydraulic systems.

Engine

5.5L V8 (M273)

• Oil Leaks
  • Description/Symptoms: Oil leaks commonly develop from the valve cover gaskets, oil filter housing gasket, or rear main seal. Symptoms include visible oil leaks, burning oil smell, and low oil level.
  • Solution: Replacing the affected gaskets or seals.
  • Estimated Cost to Fix: $300 - $1500+ depending on the location of the leak and if you DIY.
  • Recalls: None Found
• Camshaft Adjuster Plugs
  • Description/Symptoms: The camshaft adjuster plugs (also known as oil galley plugs) on the back of the cylinder heads can leak oil. This can be difficult to detect initially but will result in oil accumulation on the back of the engine and potentially drip onto the exhaust.
  • Solution: Replacing the camshaft adjuster plugs with updated versions.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Transmission

7-Speed Automatic (722.9)

• Torque Converter Failure
  • Description/Symptoms: Torque converter failure can cause shuddering, stalling, or rough shifting, especially at low speeds.
  • Solution: Replacing the torque converter, and potentially flushing the transmission.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: The valve body, which controls the flow of transmission fluid, can experience wear or malfunction. This can lead to harsh or delayed shifting, slipping, or getting stuck in a gear.
  • Solution: Replacing or rebuilding the valve body.
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found

Suspension

• Airmatic Suspension Issues
  • Description/Symptoms: The Airmatic suspension system, while providing a smooth ride, is prone to leaks in the air struts or failure of the air compressor. Symptoms include a sagging vehicle, particularly overnight, a noisy air compressor, or suspension malfunction warnings.
  • Solution: Replacing the leaking air struts or the air compressor.
  • Estimated Cost to Fix: $1000 - $3000+ per strut, $500-$1500+ for the compressor.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Excessive battery drain can occur due to faulty modules, malfunctioning sensors, or issues with the COMAND system. This can lead to a dead battery, especially if the car sits for extended periods.
  • Solution: Identifying and replacing the faulty module or component causing the drain.
  • Estimated Cost to Fix: $100 - $1000+ depending on the source of the drain.
  • Recalls: None Found
• COMAND System Malfunctions
  • Description/Symptoms: The COMAND system, which controls navigation, audio, and other vehicle functions, can experience software glitches, screen failures, or complete system shutdown.
  • Solution: Software update, screen replacement, or replacement of the COMAND unit.
  • Estimated Cost to Fix: $200 - $2000+ depending on the severity.
  • Recalls: None Found

Exterior

• Retractable Hardtop Issues
  • Description/Symptoms: The retractable hardtop mechanism can experience issues such as getting stuck, failing to open or close completely, or making unusual noises. This can be caused by hydraulic leaks, sensor failures, or motor malfunctions.
  • Solution: Repairing or replacing the hydraulic components, sensors, or motors. Inspecting and lubricating the moving parts of the top mechanism.
  • Estimated Cost to Fix: $500 - $3000+ depending on the component requiring repair or replacement.
  • Recalls: None Found

Interior

• Seat Heater Failure
  • Description/Symptoms: The seat heaters can fail due to broken heating elements or faulty control modules.
  • Solution: Replacing the heating element or control module.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2011 Mercedes-Benz SL550 offers a luxurious driving experience, but potential buyers should be aware of the common issues. Engine oil leaks and transmission problems, specifically with the torque converter and valve body, can be costly to repair. The Airmatic suspension is also a known weak point, and electrical issues such as battery drain and COMAND system malfunctions can occur. The retractable hardtop, while a desirable feature, can also require expensive repairs. Overall, while the SL550 offers a blend of performance and luxury, maintenance and repair costs can be significant.