About the Mercedes-Benz 400
The Mercedes-Benz 400 badge appears across multiple model lines, most commonly the E-Class E 400, S-Class S 400, and CLS 400. The E 400 and CLS 400 typically feature a 3.0-litre twin-turbo V6 petrol engine producing around 329-333bhp, whilst the S 400 has been offered with both petrol and hybrid variants. These executive and luxury saloons provide sophisticated technology, premium interiors with high-quality materials, and the renowned Mercedes build quality. The E 400 suits business users and families seeking performance with practicality, the S 400 represents flagship luxury, and the CLS 400 delivers coupé-styled elegance.
What Affects the Price
Age remains the primary factor, with newer models commanding significantly higher prices. The S 400 typically sits at the upper end of the price spectrum due to its flagship status, whilst E 400 models offer more accessible entry points. Mileage heavily impacts value—cars under 30,000 miles attract premium prices, whereas those exceeding 100,000 miles see substantial depreciation. Specification matters considerably; AMG Line trim, Premium Plus packages, panoramic sunroofs, and advanced driver assistance systems add value. Full Mercedes-Benz service history is essential for maintaining residual values. Condition of the interior leather, functionality of complex electronics, and paint quality all influence asking prices. Diesel variants of the S 400 d tend to hold value better than petrol equivalents due to running costs.
Buying Tips
Always verify complete service history, ideally from Mercedes-Benz main dealers, as these complex vehicles require specialist maintenance. Inspect all electronic systems thoroughly—seats, suspension, infotainment, and driver aids—as repairs can be expensive. Check for oil leaks from the engine and gearbox, common on higher-mileage examples. Ensure the 9G-Tronic automatic gearbox shifts smoothly without hesitation. Examine alloy wheels for kerb damage and verify all tyres match the correct specifications. Request evidence of recent major service items such as brake fluid, transmission oil, and air suspension servicing. Consider an independent pre-purchase inspection from a Mercedes specialist. Check MOT history online for patterns of advisories or failures. Factor in running costs—these are premium vehicles with corresponding insurance, tax, and maintenance expenses.