MERCEDES-BENZ S CLASS (2017-20) S400L 4DR SALOON LWB 2.9D DPFR SS 340 EU6 AMG LINE 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 AMG LINE 9G-T+ AUTO is a long-wheelbase luxury saloon: a large, chauffeur-friendly executive car rather than a family hatchback or SUV. In the UK it sits near the top of the premium market, appealing to buyers who want space, comfort and presence. Its AMG Line styling gives this spacious S-Class a sportier look.

mycarcheck.com has recorded 36 look-ups covering 14 different VINs, so this is a useful snapshot but not a huge sample. Those checks show an average private-sale valuation of £31,100 and average recorded mileage of 80,000 miles. Average annual mileage is 21,000, while the average number of previous keepers is about one. Treat these figures as guideposts, since individual cars can vary considerably.

This S400L suits executives, motorway travellers and families seeking calm rear-seat comfort. Its diesel engine and automatic drive make journeys easy, while the Mercedes feels spacious beside rivals such as the BMW 7 Series and Audi A8.

Considering a Mercedes S-Class? Outstanding finance, insurance write-offs, hidden damage, mileage discrepancies or theft 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 14 different vehicles, run between May 11th 2021 and October 31st 2026. These real-world insights provide context for this vehicle's place in the market, as well as its typical usage.

36
Lookups

3
Hidden Histories

89k
Average Mileage

£31,100
Average Valuation