2018 BMW M6 Gran Coupe

The 2018 BMW M6 Gran Coupe is a high-performance four-door coupe that blends luxury with exhilarating power. It came equipped with a 4.4-liter twin-turbocharged V8 engine that produced 560 horsepower and 500 lb-ft of torque in its standard form, and 600 horsepower and 516 lb-ft of torque in the Competition Package version. The engine was paired exclusively with a 7-speed dual-clutch transmission (DCT). Owners often praise the M6 Gran Coupe for its stunning design, powerful engine, and comfortable yet sporty ride. Some common dislikes include its high price tag, relatively poor fuel economy, and the DCT’s occasional low-speed jerkiness.

Engine

4.4L Twin-Turbocharged V8 (S63)

• Oil Leaks
  • Description/Symptoms: Oil leaks can develop from various locations on the engine, including the valve cover gaskets, oil pan gasket, and turbocharger oil lines. Symptoms include visible oil leaks, burning oil smell, and low oil level warnings.
  • Solution: Replacing the leaking gaskets or lines.
  • Estimated Cost to Fix: $300 - $1500+ depending on location and severity.
  • Recalls: None Found
• VANOS (Variable Valve Timing) Issues
  • Description/Symptoms: VANOS system malfunctions can cause rough idling, loss of power, and engine stalling. These issues stem from malfunctioning solenoids.
  • Solution: Diagnosis to determine the specific issue with the VANOS system and replacement of the affected components.
  • Estimated Cost to Fix: $500 - $2000+ depending on the components that need replacement.
  • Recalls: None Found
• Turbocharger Failure
  • Description/Symptoms: The twin turbochargers can fail due to oil starvation, overboost, or general wear and tear. Symptoms include a loss of power, unusual noises from the engine, and potentially an engine check light.
  • Solution: Replacement of the failed turbocharger(s).
  • Estimated Cost to Fix: $3,000 - $6,000+ for turbo replacement.
  • Recalls: None Found

Transmission

7-Speed Dual-Clutch Transmission (DCT - Getrag 7DCI600)

• DCT Mechatronics Unit Failure
  • Description/Symptoms: The mechatronics unit controls the shifting of the DCT, and failures can lead to rough shifting, inability to shift, or complete transmission failure.
  • Solution: Replacement or rebuild of the mechatronics unit.
  • Estimated Cost to Fix: $3,000 - $5,000+
  • Recalls: None Found
• DCT Clutch Wear
  • Description/Symptoms: Due to the performance-oriented nature of the M6, clutch wear can be accelerated. Symptoms include slipping during acceleration, jerky engagement, and difficulty shifting.
  • Solution: Replacement of the DCT clutches.
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found

Suspension

• Adaptive Damper Failure
  • Description/Symptoms: The M6 Gran Coupe comes equipped with adaptive dampers that can fail over time, leading to a harsh or bouncy ride. Error messages related to the suspension may also appear on the dashboard.
  • Solution: Replacement of the failed dampers.
  • Estimated Cost to Fix: $1,500 - $4,000+ depending on how many dampers need to be replaced.
  • Recalls: None Found

Electrical

• iDrive System Issues
  • Description/Symptoms: The iDrive system can experience glitches, freezing, or complete failure. This can affect navigation, entertainment, and vehicle settings.
  • Solution: Software updates or replacement of the iDrive unit.
  • Estimated Cost to Fix: $200 - $2000+ depending on the issue.
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Some owners report issues with excessive battery drain, especially when the car is not driven frequently. This can lead to difficulty starting the vehicle.
  • Solution: Diagnosing parasitic drain, replacement of the battery, or addressing faulty electronic components.
  • Estimated Cost to Fix: $150 - $1000+ depending on the cause of the drain.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Center Console Trim Delamination/Wear
  • Description/Symptoms: The soft-touch materials on the center console can become sticky, peel, or delaminate over time.
  • Solution: Replacement of the affected trim pieces.
  • Estimated Cost to Fix: $300 - $1000+ depending on the specific parts.
  • Recalls: None Found

Summary

The 2018 BMW M6 Gran Coupe, while a luxurious and powerful vehicle, can present owners with some notable issues. The engine and transmission are potential areas of concern, with oil leaks, VANOS problems, turbocharger failures, and DCT issues being the most frequently reported. Suspension and electrical problems can also occur. The severity of these issues can range from minor glitches to major mechanical failures, with repair costs potentially reaching several thousand dollars. Overall, it’s a great vehicle but if it is not well maintained, the costs could be detrimental.