# Mercedes GLB AMG — Used Car Buying Guide AutoScout's analysis of the Mercedes GLB AMG on the UK used-car market. Backed by 33 million DVSA MOT tests, current AutoTrader pricing, and depreciation curves derived from CAP/Glass's Guide data. Live interactive report: https://autoscout.fyi/cars/mercedes-glb-amg ## Verdict - **Best value year**: 2021 - **Ideal trim**: GLB 35 AMG - **Target mileage**: 30,000–50,000 miles - **Max previous owners**: 2 - **Target price**: £32,500 ## Why this model The Mercedes GLB 35 AMG is a fantastic choice if you're looking for a practical family SUV that doesn't compromise on performance or premium feel. It offers genuine AMG thrills with its powerful engine and sporty handling, but still retains the GLB's spacious and versatile interior, including the option for seven seats. It's a great blend of everyday usability and exciting driving dynamics, making it stand out in the compact SUV segment. ## What you should pay For a 2021 Mercedes GLB 35 AMG with around 30,000-50,000 miles, you should expect to pay in the region of £30,000-£35,000. While the standard GLB models have seen some price softening, the performance-oriented AMG 35 holds its value a bit better due to its niche appeal and higher original price. Always compare prices across AutoTrader and Motors.co.uk, and be prepared to negotiate, especially if the car has been on the market for a while. ## Which trim to buy The GLB 35 AMG is the ideal trim if you're specifically looking for the 'AMG' experience in a GLB. It comes with a significantly more powerful engine, sport-tuned suspension, upgraded brakes, and more aggressive styling than the AMG Line models. While the AMG Line trims look sporty, the GLB 35 AMG delivers the actual performance to match. It offers the best balance of performance and practicality within the GLB range, making it a truly engaging drive without sacrificing the family-friendly aspects. ## What to check before you buy - MBUX infotainment system glitches - Higher brake and tyre wear due to performance - Minor electrical gremlins reported by some owners ## Running costs Running a GLB 35 AMG will be pricier than a standard GLB. Fuel costs for its 30-32 mpg will be around 22p per mile. Road tax (VED) for a 2021 model will be £580 for 2026 (due to the premium car tax supplement), dropping to £190 from 2027 onwards. Insurance will be higher due to its performance, likely in the range of £800-£1500+ per year depending on your circumstances. Servicing at a Mercedes specialist or main dealer can also be expensive. ## Key stats - **Fuel Type**: Petrol - **Horsepower**: 306 hp - **Mpg**: 30-32 mpg - **Reliability Score**: Good - **Safety Rating**: 5-star Euro NCAP (2019) ## Trim comparison | Trim | Price new | Price used | Key features | | --- | --- | --- | --- | | GLB 200 AMG Line | £38,000 | £25,000 | AMG body styling; 19-inch AMG alloy wheels; MBUX infotainment system with 10.25-inch display | | GLB 220d AMG Line Premium | £45,000 | £29,000 | AMG body styling; 20-inch AMG alloy wheels; MBUX infotainment with augmented reality navigation | | GLB 35 AMG | £50,000 | £32,500 | AMG-specific styling and grille; AMG Performance 4MATIC all-wheel drive; AMG SPEEDSHIFT DCT 8G transmission | ## Depreciation forecast | Year | Estimated value | Retention | | --- | --- | --- | | 2026 | £32,500 | 100% | | 2027 | £29,250 | 90% | | 2028 | £26,325 | 81% | | 2029 | £23,692 | 73% | | 2030 | £21,323 | 66% | The sweet spot for buying a used GLB 35 AMG is typically around 3-4 years old, as the initial steep depreciation has already occurred. Selling after 2-3 years of ownership (when the car is 5-6 years old) will see a more gradual loss in value, but holding onto it much longer will see the value drop below 50% of its original new price. Buying a 2021 model now means you're past the steepest part of the curve. Total value lost since new: 34.4%. ## Alternatives to consider - Audi SQ2 - BMW X1 M35i - Cupra Formentor VZ3 --- Source: AutoScout (https://autoscout.fyi). Part of a review of the UK used-car market across 500+ models.