2020 — 2026
3.0L Turbo Mild Hybrid - S450 4MATIC
Hybrid
Navigate over uneven surfaces or speed bumps to listen for any knocking or creaking from the AIRMATIC air suspension, as these units can show signs of age in higher mileage examples.
Operate the MBUX infotainment system thoroughly while stationary and moving; ensure the touchpads and voice commands respond promptly, as software glitches can occasionally occur.
Put the car into 'Sport' mode and perform a gentle acceleration test to ensure the 9G-TRONIC transmission shifts seamlessly without any hesitation or harsh gear changes.
Before turning off the engine, cycle through all electric seat adjustments, including the massage and bolsters, to ensure the complex electronic motors are functioning as intended.
Consider a full check of the suspension bushings and air strut integrity to maintain that signature smooth Mercedes ride quality.
Usually marks the point for a major service, including spark plug replacement and inspection of the auxiliary belt system.
A common interval to evaluate the condition of transmission fluid and the cooling system components to ensure the mild-hybrid drivetrain remains efficient.
Keep a close eye on your service history; these vehicles thrive when maintained strictly to the manufacturer's schedule at a qualified specialist.
Monitor the engine oil level between services, as high-performance turbo units can sometimes consume small amounts of oil as they age.
Regularly clean the camera lenses and sensor housings to ensure the Driver Assistance systems provide accurate data.
Ensure the auxiliary battery is checked during annual servicing, as it supports the extensive electronic features within the vehicle.
Use premium 95 or 98 octane fuel to help the sophisticated direct-injection engine run cleaner and more efficiently over the long term.
Estimated repair costs if issues arise
If the vehicle begins to sag after being parked for a few days, it's common to consider budgeting for strut or pump maintenance. Replacing these involves high-spec components to maintain the ride height and comfort settings.
Given the weight of the S-Class, the braking system works hard. Depending on your driving style, you might eventually need to budget for a full set of pads and discs, which are significant in size for this chassis.
The mild-hybrid battery is a complex component. While not an immediate concern, if you plan to own the car long-term, it's worth keeping a reserve for potential diagnostics or module updates in the future.
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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