2018 Mercedes-Benz S600L

The 2018 Mercedes-Benz S600L represents the pinnacle of luxury and performance within the S-Class lineup. This model year offered a single powertrain option: a 6.0-liter twin-turbo V12 engine producing 621 horsepower and 738 lb-ft of torque, paired exclusively with a 7-speed automatic transmission (7G-TRONIC PLUS). Known for its opulent interior, smooth ride, and advanced technology, the S600L appeals to buyers seeking the ultimate in comfort and prestige. However, some owners have reported issues related to the car’s complex systems, particularly its electrical components and air suspension. Potential drawbacks include high maintenance costs and the potential for expensive repairs due to the advanced technology.

Engine

6.0L Twin-Turbo V12

• Oil Leaks from Valve Cover Gaskets
  • Description/Symptoms: Oil leaking onto exhaust components, burning oil smell, visible oil residue on the engine.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $1,000 - $1,800+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Low coolant level, overheating, visible coolant leaks around the engine area.
  • Solution: Repair or replacement of leaking hoses, water pump, or radiator.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found

Transmission

7G-TRONIC PLUS (7-Speed Automatic)

• Rough or Delayed Shifting
  • Description/Symptoms: Hesitation when shifting gears, jerky movements, or abnormal sounds during gear changes.
  • Solution: Transmission fluid flush and filter replacement, or valve body repair/replacement. In severe cases, complete transmission replacement may be necessary.
  • Estimated Cost to Fix: $300 - $7,000+
  • Recalls: None Found

Suspension

• AIRMATIC Air Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, ride height malfunction message, compressor failure.
  • Solution: Replacement of air struts, air compressor, or valve block.
  • Estimated Cost to Fix: $1,500 - $4,000+ per strut
  • Recalls: None Found

Electrical

• Malfunctioning COMAND System
  • Description/Symptoms: Screen freezing, unresponsive buttons, navigation issues, Bluetooth connectivity problems.
  • Solution: Software update, replacement of the COMAND unit.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Frequent jump starts needed, dead battery overnight, warning messages about low battery voltage.
  • Solution: Diagnose parasitic drain, replace faulty module, or replace battery.
  • Estimated Cost to Fix: $200 - $1,500+
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Various warning lights, malfunctioning driver-assistance features (e.g., blind-spot monitoring, lane-keeping assist), parking sensor errors.
  • Solution: Diagnosis and replacement of faulty sensors.
  • Estimated Cost to Fix: $200 - $800+ per sensor
  • Recalls: None Found

Exterior

• Automatic Trunk Closing Issues
  • Description/Symptoms: Trunk not closing properly, trunk closing on its own, error messages on the dashboard.
  • Solution: Check and replace the trunk motor, trunk latch, or hydraulic struts.
  • Estimated Cost to Fix: $400 - $1,500+
  • Recalls: None Found

Interior

• Seat Massage/Adjustments Not Working
  • Description/Symptoms: Seat functions become inoperative.
  • Solution: Repair or replacement of the seat motor or control module.
  • Estimated Cost to Fix: $300 - $1,200+
  • Recalls: None Found

Summary:

The 2018 Mercedes-Benz S600L, while offering unparalleled luxury, can present owners with significant repair bills. The most frequently reported issues revolve around the air suspension, electrical system, and engine oil leaks. Electrical problems are often the most annoying due to the complexity of the vehicle’s features. Suspension repairs can be costly, and engine repairs are not uncommon. Potential owners should be prepared for the possibility of expensive repairs as the vehicle ages.