2015 Mercedes-Benz G65 AMG

The 2015 Mercedes-Benz G65 AMG is a high-performance, ultra-luxury SUV known for its iconic boxy design, powerful engine, and exceptional off-road capabilities. Beyond the G65, the 2015 G-Class also offered the G550 with a 4.0L V8 engine. However, the G65 AMG boasts a handcrafted 6.0L twin-turbo V12 engine, producing a staggering 621 horsepower and 738 lb-ft of torque. The G65 AMG is exclusively paired with a 7G-TRONIC seven-speed automatic transmission. Owners often praise its unique blend of luxury, performance, and ruggedness. Conversely, common criticisms include its high price tag, poor fuel economy, and somewhat dated interior compared to other luxury SUVs.

Engine

6.0L Twin-Turbo V12

• Oil Leaks
  • Description/Symptoms: Oil leaks can occur from various locations on the engine, including valve cover gaskets, oil cooler lines, and the front crankshaft seal. Symptoms include visible oil leaks under the vehicle, a burning oil smell, and low oil levels.
  • Solution: Replacing the leaking gaskets, lines, or seals. Thorough cleaning of the affected area is recommended.
  • Estimated Cost to Fix: $300 - $1,500+, depending on the location and severity of the leak.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: The twin turbochargers on the V12 engine can experience issues such as wastegate malfunctions or bearing failures. Symptoms include reduced power, turbo lag, whistling noises from the engine bay, and potentially check engine lights.
  • Solution: Replacing or rebuilding the affected turbocharger(s). In some cases, replacing the wastegate actuator can resolve the issue.
  • Estimated Cost to Fix: $3,000 - $8,000+ per turbocharger, including labor.
  • Recalls: None Found
• Ignition Coil Failure
  • Description/Symptoms: Misfires can occur due to failing ignition coils. The V12 engine has 12 ignition coils, so diagnosing the faulty one is critical. Symptoms include rough running, loss of power, check engine light (likely flashing), and potentially a strong fuel smell.
  • Solution: Replacing the faulty ignition coil(s). It’s often recommended to replace them in pairs or all at once to ensure consistent performance.
  • Estimated Cost to Fix: $200 - $500+ per coil, including labor and diagnosis.
  • Recalls: None Found

Transmission

7G-TRONIC 7-Speed Automatic

• Harsh Shifting
  • Description/Symptoms: Abrupt or jerky shifts between gears, especially during upshifts or downshifts. This can be more pronounced at lower speeds.
  • Solution: First, check and replace the transmission fluid and filter. If the issue persists, the valve body may need to be rebuilt or replaced.
  • Estimated Cost to Fix: Transmission fluid and filter change: $300 - $600. Valve body repair/replacement: $1,500 - $4,000+.
  • Recalls: None Found
• Torque Converter Issues
  • Description/Symptoms: Slipping or shuddering during acceleration, especially at highway speeds. Can also manifest as a whining noise from the transmission area.
  • Solution: Replacing the torque converter. Inspecting the transmission for any damage caused by the failing torque converter is crucial.
  • Estimated Cost to Fix: $2,000 - $5,000+, including labor and parts.
  • Recalls: None Found

Suspension

• Air Suspension Leaks/Failure
  • Description/Symptoms: The air suspension system can develop leaks in the air struts or air lines. Symptoms include the vehicle sitting unevenly, the air compressor running constantly, and suspension malfunction warnings.
  • Solution: Replacing the leaking air struts or air lines. If the compressor has been overworked, it may also need to be replaced.
  • Estimated Cost to Fix: Air strut replacement: $1,500 - $3,000+ per strut. Air compressor replacement: $800 - $1,500+.
  • Recalls: None Found

Electrical

• Sensor Failures
  • Description/Symptoms: Various sensors throughout the vehicle can fail, leading to warning lights and performance issues. Common culprits include oxygen sensors, mass airflow sensors, and crankshaft position sensors.
  • Solution: Diagnosing the faulty sensor and replacing it.
  • Estimated Cost to Fix: $200 - $800+ per sensor, including labor and diagnosis.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Sunroof Issues
  • Description/Symptoms: The sunroof mechanism can sometimes malfunction, leading to difficulty opening or closing the sunroof, or unusual noises.
  • Solution: Repairing or replacing the sunroof mechanism.
  • Estimated Cost to Fix: $500 - $2,000+, depending on the severity of the issue.
  • Recalls: None Found

Summary

The 2015 Mercedes-Benz G65 AMG, while an exceptional vehicle, can suffer from costly issues. Engine problems, particularly oil leaks and turbocharger malfunctions on the V12 engine, are potential concerns. The 7G-TRONIC transmission can also exhibit shifting problems. The air suspension system is also prone to leaks. These issues can range from moderately expensive to very expensive to repair, making pre-purchase inspections and a thorough maintenance history essential for prospective buyers.