2008 Mercedes-Benz R500

The 2008 Mercedes-Benz R500 is a luxury wagon known for its spacious interior, comfortable ride, and blend of SUV practicality with minivan-like passenger capacity. It came equipped with a 5.0L V8 engine that produced 302 horsepower and 339 lb-ft of torque. Other engine options included a 3.5L V6 and a 3.0L turbo-diesel V6 (R320 CDI). The R500 was generally liked for its smooth ride and luxurious features, but owners often disliked its fuel economy and potential for expensive repairs. All engines were paired with a 7-speed automatic transmission.

Engine

5.0L V8 (M113)

• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks from the valve cover gaskets, leading to burning oil smell and potential oil loss.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Oil Cooler Leaks
  • Description/Symptoms: Oil leaks from the engine oil cooler seals, leading to oil loss.
  • Solution: Replace the oil cooler seals.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found

Transmission

7-Speed Automatic (722.9)

• Valve Body Failure
  • Description/Symptoms: Harsh or delayed shifting, transmission slipping, getting stuck in gear, or complete transmission failure. The conductor plate within the valve body is a common culprit.
  • Solution: Replace the valve body or conductor plate. Requires specialized tools and knowledge.
  • Estimated Cost to Fix: $1000 - $3000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering at low speeds, especially during light acceleration. Can also manifest as vibrations or a complete lack of engagement.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $1500 - $3500+
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, suspension malfunction warning light, harsh ride. The air struts or the air compressor can fail.
  • Solution: Replace the failed air strut(s) or air compressor.
  • Estimated Cost to Fix: $800 - $2000+ per strut, $500 - $1500+ for the compressor
  • Recalls: None Found
• Rear Air Springs Leaking
  • Description/Symptoms: Rear of the vehicle sagging, especially overnight. Hissing sound from the rear suspension.
  • Solution: Replace the rear air springs.
  • Estimated Cost to Fix: $600 - $1500+
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Battery draining overnight or within a few days of sitting. Can be caused by faulty modules or systems not shutting down properly.
  • Solution: Diagnose the source of the parasitic drain and repair or replace the faulty component.
  • Estimated Cost to Fix: Varies greatly depending on the source, $200 - $1000+
  • Recalls: None Found
• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, inability to start the car, steering wheel not unlocking.
  • Solution: Replace the EIS module. Requires programming and potentially a new key.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found

Exterior

• Rust on Wheel Arches/Fenders
  • Description/Symptoms: Rust bubbling or perforation on the wheel arches and fenders, especially in areas with harsh winters or road salt usage.
  • Solution: Repair or replace the affected body panels.
  • Estimated Cost to Fix: $500 - $2000+ per panel, depending on the severity and repair method.
  • Recalls: None Found
• Tail Light Assembly Failure
  • Description/Symptoms: Partial or complete failure of the tail light assembly due to corrosion or bulb socket issues.
  • Solution: Replace the tail light assembly.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making excessive noise. The sunroof motor or track can fail.
  • Solution: Repair or replace the sunroof motor, track, or other components.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found
• Navigation/Infotainment System Malfunctions
  • Description/Symptoms: Screen freezing, system not responding, navigation errors, or complete system failure.
  • Solution: Attempt software updates, or replace the head unit.
  • Estimated Cost to Fix: $200 - $1500+
  • Recalls: None Found

Summary

The 2008 Mercedes-Benz R500, while offering a comfortable and spacious driving experience, is prone to several issues that can lead to significant repair costs. The air suspension, transmission, and electrical systems are common sources of problems. Owners should be prepared for potential expenses related to these systems. While the engine itself is generally reliable, leaks can develop over time. Due to the age of the vehicle, preventative maintenance is vital to ensure its longevity.