MERCEDES-BENZ S CLASS (2017-20) S400L 4DR SALOON LWB 2.9D DPFR SS 340 EU6 GRAND EDITION 9G-T+ AUTO
Buyer's Guide & Data from our Checks
The MERCEDES-BENZ S CLASS (2017-20) S400L 4DR SALOON LWB 2.9D DPFR SS 340 EU6 GRAND EDITION 9G-T+ AUTO is a long-wheelbase luxury saloon: a large, refined four-door aimed at the top end of the UK executive-car market. It prioritises space, comfort and quiet progress over compact dimensions or sporty practicality.
With its extended cabin and generous rear-seat room, the S400L suits senior professionals, chauffeur services and buyers wanting a comfortable business car. The diesel engine and automatic transmission make it well suited to long journeys and motorway use; it is less at home in tight city streets or where low running costs are the priority.
Mycarcheck.com records four look-ups, but these cover just one distinct VIN, so the figures are indicative rather than a broad market picture. That example averaged £33,100 in private-sale valuation, 40,000 recorded miles, 6,000 miles yearly and one previous keeper. The Grand Edition combines stately comfort with strong performance, competing with the BMW 7 Series and Audi A8 through its spacious, comfortable feel.
Considering a Mercedes S-Class? Outstanding finance, write-offs, hidden damage, stolen status or clocked mileage could turn a luxury buy into a costly mistake. Enter the reg now and check before you commit.
Key Findings
The following statistics are drawn from our checks of 1 different vehicles, run between November 14th 2025 and October 31st 2026. These real-world insights provide context for this vehicle's place in the market, as well as its typical usage.
4
Lookups
Lookups
0
Hidden Histories
Hidden Histories
42k
Average Mileage
Average Mileage
£33,100
Average Valuation
Average Valuation
