2020 — 2026
3.0L Inline-6 Turbo (S450) - Mild-hybrid refined petrol
Petrol
Navigate through the MBUX infotainment menus while stationary and while driving. Look for any lag or screen flickering, as the complex software architecture can occasionally experience glitches in early production models.
Listen closely for any air suspension 'knocks' or uneven ride height when moving from a stop to cruising speed. Check that the vehicle levels itself correctly after being parked.
Gently test the door handles while the vehicle is locked and unlocked. Ensure the flush-fitting door handle mechanism operates smoothly without hesitation or abnormal motor sounds.
During low-speed maneuvering, pay attention to the rear-axle steering (if fitted). Ensure there is no unusual clicking or resistance when performing full-lock turns, as this system is highly sophisticated.
Consider a full transmission fluid and filter service to ensure the 9G-TRONIC gearbox continues to operate with factory-standard smoothness.
An appropriate time to have the mild-hybrid battery health assessed and the auxiliary cooling systems inspected for any minor weeping at hose junctions.
Standard time to evaluate the condition of air suspension struts and associated bushings to maintain that signature Mercedes-Benz ride quality.
Verify the service history specifically mentions the use of Mercedes-Benz approved synthetic oils to protect the turbocharger and high-precision injectors.
Check the brake pad and disc wear sensors, as these performance-oriented items can wear sooner depending on the previous owner's driving style.
Ensure all software updates have been performed by an authorized service center to keep the mild-hybrid system running at peak efficiency.
Inspect the panoramic sunroof tracks for debris, as keeping them clean helps the motors operate smoothly for years to come.
Confirm the air filtration system, particularly the cabin air filters, has been changed recently to maintain the effectiveness of the climate control ionization system.
Estimated repair costs if issues arise
While robust, the air bags and compressor are complex components. Depending on the car's history, you might eventually need to budget for the replacement of a strut or the compressor assembly to maintain that floating-on-a-cloud ride.
The 48-volt lithium-ion battery is the heart of the engine's efficiency. If this component needs attention in the future, it is a specialized unit that requires professional diagnostics and careful handling.
These vehicles carry significant weight and performance capability, which means the braking system works quite hard. It is common to consider a full replacement set as a major future maintenance item.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer