2020 Mercedes-Benz GLS 2.9
Price: £39,990. Fair price: £147 (under 1%) over the AskCar estimate of £39,843, our expected asking price for this car from its model, age, mileage and specification, drawing on 143 priced Mercedes-Benz GLS adverts on AskCar as of 8 November 2026.
AskCar lists 150 used Mercedes-Benz GLS from 116 UK dealerships, as of 8 November 2026.
Overview
- Make: Mercedes-Benz
- Model: GLS
- Version: 2.9 Auto 4WD Euro 6 5dr (325 bhp)
- Year: 2020
- Mileage: 77,165 miles
- Fuel: Diesel
- Body: SUV, 5 doors, 7 seats
- Engine: 2.9 litres, 325 bhp
- Gearbox: Automatic
- Drive: Four-wheel drive
- Colour: Grey
- CO2: 208 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
At 77,165 miles, this 2020 Mercedes-Benz GLS has covered about 16,600 more miles than other 2020 Mercedes-Benz GLS cars. Its asking price of £39,990 is £147 above the AskCar estimate of £39,843. The AskCar estimate draws on 143 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records 4 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Stratstone Mercedes-Benz of Chelmsford, based in Chelmsford. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 8 November 2026.
Price
Fair price: £147 (under 1%) over the AskCar estimate of £39,843.
The AskCar estimate is our expected asking price for this car. It uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It is an advertised price, not a confirmed sale price.
It draws on 143 priced Mercedes-Benz GLS adverts across different ages and specifications, as of 8 November 2026.
A 2020 Mercedes-Benz GLS with the 2.9 diesel engine is typically advertised at £45,400: the median of the 12 for sale on AskCar, as of 8 November 2026.
Time on sale
AskCar first saw this 2020 Mercedes-Benz GLS advertised 4 days ago.
Price history
AskCar first saw this advert on 4 November 2026 at £39,990. Its asking price has not changed.
Mileage and MOT
MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 8 February 2027.
It has had 5 MOTs. The latest, on 9 February 2026, passed.
Advisories at the latest test: nearside rear tyre worn close to legal limit/worn on edge; offside rear tyre worn close to legal limit/worn on edge.
Mileage at that test: 67,446 miles, which matches the advertised 77,165 miles.
Advertised mileage is about 16,600 miles higher than the median mileage of a 2020 Mercedes-Benz GLS on AskCar.
Browse all Mercedes-Benz GLS cars for sale · 2020 Mercedes-Benz GLS price guide
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Photos
42 photos of this car are on its AskCar page.
As of 8 November 2026, AskCar lists 595,762 cars and vans from 12,892 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.