2021 Mercedes-Benz GLB 2.0 AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line Premium
• Version: 2.0 AMG Line Premium Auto Euro 6 5dr
• Year: 2021
• Mileage: 68,280 miles
• Fuel: Diesel
• Body: SUV, 5 doors
• Engine: 2.0 litres
• Gearbox: Automatic
• Colour: Black
• CO2: 164 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line Premium is advertised with 68,280 miles, approximately 20,900 above the typical mileage for its age. The dealer is asking £21,200, which is £642 above the AskCar estimate of £20,558. To work out the AskCar estimate, we analyse UK dealer adverts for 835 Mercedes-Benz GLB cars across different ages and specifications. We first saw this car advertised 33 days ago. Its asking price has since fallen by £1,300. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Sytner Select Swindon, based in Swindon. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 10 November 2026.

How we estimate prices and check cars

Price

Fair price: £642 (3%) over the AskCar estimate of £20,558.

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 835 priced Mercedes-Benz GLB adverts across different ages and specifications, as of 10 November 2026.

A 2021 Mercedes-Benz GLB with the 2.0 diesel engine is typically advertised at £22,800: the median of the 30 for sale on AskCar, as of 10 November 2026.

Time on sale

This 2021 Mercedes-Benz GLB has been on sale for at least 33 days.

Price history

AskCar first saw this advert on 8 October 2026 at £22,500. Its asking price is now £21,200, £1,300 less. The latest price cut was seen on 15 October 2026.

Price changes recorded:

• 8 October 2026: £22,500
• 15 October 2026: £21,200

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 10 November 2026: valid until 9 January 2027.

It has had 4 MOTs. The latest, on 10 January 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 57,364 miles, which matches the advertised 68,280 miles.

Advertised mileage is about 20,900 miles higher than the median mileage of a 2021 Mercedes-Benz GLB on AskCar.

Similar cars

15 other 2021 Mercedes-Benz GLB AMG Line Premium 2.0 diesel automatic SUVs are for sale at UK dealers, from £18,295 to £24,995, as of 10 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, white. Mileage: 69,085 miles. Price: £19,940, £1,260 less than this car. Dealer: Evans Halshaw BYD Rotherham in Rotherham. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-d962abb94c3a
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, red. Mileage: 69,798 miles. Price: £19,490, £1,710 less than this car. Dealer: Group 1 Automotive Mercedes-Benz Of Kings Lynn in King's Lynn. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-c6ffaf631d0f
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, grey. Mileage: 71,014 miles. Price: £18,295, £2,905 less than this car. Dealer: Tenby Car Supermarket in Luton. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-fe29ace2ee1c

• The nearest: 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, red, 30 miles from this car. Mileage: 64,540 miles. Price: £19,886, £1,314 less than this car. Dealer: Heritage Honda Gloucester in Gloucester. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-20589ade1fdf