2008 Mercedes-Benz E320

The 2008 Mercedes-Benz E320 Bluetec is a popular choice for its blend of luxury, comfort, and fuel efficiency, thanks to its diesel engine. This model year of the W211 E-Class also offered other engine options, including various gasoline V6 and V8 engines. The E320 Bluetec features a 3.0-liter turbodiesel V6 engine, producing around 210 horsepower and 400 lb-ft of torque, known for its smooth power delivery and impressive fuel economy. While owners generally appreciate the car’s comfortable ride, elegant interior, and advanced features for its time, common complaints often revolve around maintenance costs, electrical issues, and the complexities of the diesel engine.

Engine

3.0L Turbodiesel V6 (OM642)

• Oil Cooler Seal Leak
  • Description/Symptoms: Oil leaking from the engine, often pooling in the valley between the cylinder banks. This can lead to a burning oil smell and, if severe, can damage other components.
  • Solution: Replacement of the oil cooler seals.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Swirl Motor Failure
  • Description/Symptoms: Check engine light, reduced engine performance, limp mode. The swirl motor controls flaps in the intake manifold that optimize airflow.
  • Solution: Replacement of the swirl motor or swirl flap assembly. Some owners opt for a delete kit.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found
• Glow Plug Failure
  • Description/Symptoms: Difficult starting, especially in cold weather, check engine light.
  • Solution: Replacement of the faulty glow plug(s).
  • Estimated Cost to Fix: $200 - $600+ (depending on how many need replacing)
  • Recalls: None Found
• Diesel Particulate Filter (DPF) Issues
  • Description/Symptoms: Reduced engine performance, check engine light, frequent regeneration cycles, potential clogging.
  • Solution: Forced regeneration, cleaning, or replacement of the DPF.
  • Estimated Cost to Fix: $300 (cleaning) to $2000+ (replacement)
  • Recalls: None Found

Transmission

7G-Tronic (722.9)

• Conductor Plate Failure
  • Description/Symptoms: Harsh shifting, erratic shifting, getting stuck in gear, limp mode. The conductor plate houses the transmission’s electronic control unit and sensors.
  • Solution: Replacement of the conductor plate.
  • Estimated Cost to Fix: $800 - $1800+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Slipping between gears, delayed engagement, rough shifting.
  • Solution: Replacement or rebuild of the valve body.
  • Estimated Cost to Fix: $1000 - $2500+
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure (if equipped)
  • Description/Symptoms: Vehicle sagging on one or more corners, failure to maintain ride height, compressor failure, “Vehicle Too Low” warning.
  • Solution: Replacement of the air struts, air compressor, or air lines.
  • Estimated Cost to Fix: $800 - $2000+ per strut, $500 - $1500+ for the compressor
  • Recalls: None Found
• Front Control Arm Bushing Failure
  • Description/Symptoms: Clunking noises from the front suspension, especially over bumps, vague steering.
  • Solution: Replacement of the control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, inability to start the car, steering wheel locked.
  • Solution: Replacement of the EIS and potentially reprogramming.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Various electrical malfunctions, such as lights not working, wipers not functioning, or issues with the power windows.
  • Solution: Replacement of the faulty SAM unit and reprogramming.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door not locking or unlocking with the remote or interior switch.
  • Solution: Replacement of the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Exterior

• Rust (Especially around wheel wells and undercarriage)
  • Description/Symptoms: Visible rust spots, bubbling paint.
  • Solution: Rust repair, body work, and repainting.
  • Estimated Cost to Fix: $300 - $2000+ depending on severity.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof failing to open or close properly, motor failure, jamming.
  • Solution: Repair or replacement of the sunroof motor or mechanism.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found
• Center Console Buttons Wear
  • Description/Symptoms: The painted finish on the center console buttons (e.g., climate control, radio) wears off, making them look faded and worn.
  • Solution: Replacement of the buttons or entire center console trim.
  • Estimated Cost to Fix: $50 - $300+ depending on the complexity of the repair.
  • Recalls: None Found

Summary

The 2008 Mercedes-Benz E320 Bluetec, while offering a luxurious and efficient driving experience, is prone to several issues common to its generation. The diesel engine, while reliable, can suffer from oil leaks, swirl motor failures, and DPF problems, leading to potentially costly repairs. Transmission issues related to the conductor plate and valve body are also prevalent. Airmatic suspension, if equipped, can add to the maintenance burden. Electrical problems stemming from the EIS, SAM modules, and door lock actuators can also be frustrating. While some issues may be relatively inexpensive to fix, others, particularly those involving the engine, transmission, or suspension, can result in significant repair bills. Pre-purchase inspections and diligent maintenance are crucial for mitigating these risks.