2008 Mercedes-Benz SL65 AMG

2008 Mercedes-Benz SL65 AMG

Overview

The 2008 Mercedes-Benz SL65 AMG, a high-performance roadster, is renowned for its potent V12 engine and luxurious features. While generally well-built, its complex nature and high-performance tuning mean that certain areas can be prone to issues, particularly as the vehicle ages. Owners should be aware of potential concerns related to the powertrain, electronics, and specialized systems that contribute to its exhilarating driving experience. Regular and specialized maintenance is crucial for preserving the reliability and performance of this exotic vehicle.

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Engine

6.0L Twin-Turbo V12 (M275)

Turbocharger Failure

• Symptoms: Loss of power, excessive smoke, whining noises from the engine bay.
• Solution: Replacement of turbochargers.
• Cost: $4,000 - $8,000

Intercooler Leaks

• Symptoms: Reduced engine performance, overheating, rough idling.
• Solution: Repair or replacement of intercooler hoses and components.
• Cost: $800 - $1,500

Ignition Coil Failure

• Symptoms: Misfires, rough idle, check engine light illumination.
• Solution: Replacement of faulty ignition coils.
• Cost: $300 - $600 per coil

Transmission

5-Speed Automatic (722.6)

Torque Converter Issues

• Symptoms: Slipping gears, shuddering during acceleration, delayed engagement.
• Solution: Rebuild or replacement of the torque converter.
• Cost: $1,500 - $3,000

Transmission Control Module (TCM) Failure

• Symptoms: Erratic shifting, transmission warning lights, inability to select gears.
• Solution: Replacement of the TCM.
• Cost: $800 - $1,500

Suspension

Active Body Control (ABC)

Hydraulic Leaks

• Symptoms: Vehicle sagging, suspension warning lights, fluid leaks under the car.
• Solution: Repair or replacement of hydraulic lines, pumps, or struts.
• Cost: $1,000 - $4,000 per component

ABC Pump Failure

• Symptoms: Loss of hydraulic pressure, suspension dropping, loud whining noises.
• Solution: Replacement of the ABC hydraulic pump.
• Cost: $1,200 - $2,500

Electrical

Infotainment System

COMAND System Glitches

• Symptoms: Screen freezing, audio issues, navigation malfunctions.
• Solution: Software updates or replacement of the COMAND unit.
• Cost: $500 - $2,000

Sensors

Various Sensor Failures (e.g., ABS, Parking Assist)

• Symptoms: Illuminated warning lights on the dashboard, system malfunctions.
• Solution: Diagnosis and replacement of faulty sensors.
• Cost: $200 - $500 per sensor

Exterior

Retractable Hardtop Mechanism

Actuator and Motor Issues

• Symptoms: Roof failing to open or close properly, unusual noises during operation.
• Solution: Repair or replacement of roof actuators, motors, or hydraulic components.
• Cost: $1,000 - $3,000

Interior

Climate Control System

Blower Motor Resistor Failure

• Symptoms: Fan only working on certain speeds or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $150 - $300

Seat Adjustment Motors

Malfunctioning Seat Adjustments

• Symptoms: Power seats not moving or moving erratically.
• Solution: Replacement of seat adjustment motors or control modules.
• Cost: $400 - $800 per seat

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Summary Verdict

The 2008 Mercedes-Benz SL65 AMG is a complex and powerful machine. While its V12 engine and advanced systems offer incredible performance, they also present potential reliability challenges, especially as the vehicle ages. Key areas to monitor include the twin-turbo V12 engine’s components like turbochargers and intercoolers, the 5-speed automatic transmission, and the sophisticated Active Body Control (ABC) suspension system, which can be costly to repair. Electrical gremlins, particularly with the COMAND system and various sensors, are also not uncommon. The retractable hardtop mechanism requires careful maintenance. Despite these potential issues, with diligent maintenance and prompt attention to any developing problems, the SL65 AMG can remain a thrilling and rewarding exotic car.