# BMW X6 — Used Car Buying Guide

AutoScout's analysis of the BMW X6 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/bmw-x6

## Verdict

- **Best value year**: 2021
- **Ideal trim**: xDrive40d M Sport
- **Target mileage**: 30,000

–50,000 miles
- **Max previous owners**: 2
- **Target price**: £39,890

## Why this model

The BMW X6 is a fantastic choice if you're looking for a luxury SUV that stands out from the crowd. It combines the practicality of an SUV with the sleek, sporty lines of a coupe, giving it a unique presence on the road. You get a high driving position, a plush interior, and powerful engines, making it great for long journeys or just cruising around town. It's a premium vehicle, so expect a high level of comfort, technology, and driving dynamics that BMW is known for.

## What you should pay

Based on current UK market data (February 2026), a 2021 BMW X6 xDrive40d M Sport with around 30,000-50,000 miles typically sells for around 

£39,890. This price reflects the significant depreciation from new, making it a much more accessible luxury SUV. Prices can vary by 

£2,000-£4,000 depending on specific mileage, condition, and optional extras, but this is a solid target for a well-maintained example.

## Which trim to buy

The xDrive40d M Sport trim hits the sweet spot for the X6. You get a powerful yet relatively efficient 3.0-litre diesel engine that offers plenty of grunt for effortless cruising and overtaking, without the much higher running costs of the petrol M50i. The M Sport trim adds a more aggressive body kit, larger alloy wheels, and a sportier interior, which really enhances the X6's already striking looks and premium feel. It's a popular trim, meaning there's a good selection on the used market and it holds its value better than the entry-level models.

## What to check before you buy

- Air suspension faults (especially on older models)
- iDrive system glitches
- EGR cooler issues (diesel engines)
- Electrical gremlins (sensors, modules)
- Brake wear (heavy vehicle)

## Running costs

Running an X6, even a diesel, isn't cheap, but it's manageable for a luxury SUV. Fuel costs for the xDrive40d diesel will be around 

£0.17 per mile (based on £1.50/litre diesel and 40 mpg). Road tax (VED) for a 2021 model will be 

£580 per year until its 6th year of registration (April 2027), after which it drops to the standard 

£190 per year. Insurance will likely be in the 

£800-

£1,500+ range annually, depending on your personal circumstances. Servicing and parts can also be pricier than average due to its premium nature.

## Key stats

- **Fuel Type**: Diesel
- **Horsepower**: 340 hp
- **Mpg**: 38-42 mpg (combined)
- **Reliability Score**: 7/10 (Average)
- **Safety Rating**: 5-star Euro NCAP (2018, based on X5)

## Trim comparison

| Trim | Price new | Price used | Key features |
| --- | --- | --- | --- |
| xDrive30d M Sport | £68,000 | £37,500 | 20-inch alloy wheels; M Sport exterior styling; Vernasca leather upholstery |
| xDrive40d M Sport | £73,000 | £39,890 | All xDrive30d M Sport features plus:; More powerful 3.0-litre six-cylinder diesel engine; Adaptive M suspension |
| xDrive40i M Sport | £75,000 | £42,500 | All xDrive40d M Sport features plus:; 3.0-litre six-cylinder petrol engine; Increased horsepower |

## Depreciation forecast

| Year | Estimated value | Retention |
| --- | --- | --- |
| 2026 | £39,890 | 0% |
| 2027 | £35,901 | 10% |
| 2028 | £33,029 | 17.2% |
| 2029 | £30,717 | 23% |
| 2030 | £28,874 | 27.6% |

Buying a 3-5 year old BMW X6 like the 2021 model is often the sweet spot. The initial steep depreciation from new has already occurred, meaning you're letting the first owner take the biggest hit. From this point, the depreciation curve flattens out, so you'll lose less money year-on-year compared to buying new. It also means you get a modern car with plenty of life left, often still covered by some manufacturer warranty or with a good dealer warranty.

Total value lost since new: 27.6%.

## Alternatives to consider

- [Audi Q8](https://autoscout.fyi/cars/audi-q8.md)
- [Mercedes-Benz GLE Coupe](https://autoscout.fyi/cars/mercedes-gle-coupe.md)
- Porsche Cayenne Coupe

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Source: AutoScout (https://autoscout.fyi). Part of a review of the UK used-car market across 500+ models.