# Audi Q8 — Used Car Buying Guide

AutoScout's analysis of the Audi Q8 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/audi-q8

## Verdict

- **Best value year**: 2021
- **Ideal trim**: S Line 50 TDI
- **Target mileage**: 40,000–50,000 miles
- **Max previous owners**: 2
- **Target price**: £37,690

## Why this model

The Audi Q8 is a fantastic choice if you're looking for a premium SUV that combines luxury, advanced technology, and a commanding road presence. It's essentially a sportier, coupé-styled version of the Q7, offering a more distinctive look without sacrificing too much practicality. The 50 TDI diesel engine provides a great balance of power and reasonable fuel economy for a car of its size, making it suitable for both daily commutes and long-distance cruising. Audi's quattro all-wheel drive system ensures excellent grip and stability in all conditions, and the interior quality is top-notch, with a sophisticated dual-screen MMI infotainment system.

## What you should pay

Based on current UK market data for February 2026, a 2021 Audi Q8 S Line 50 TDI with around 30,000-50,000 miles typically sells for around £37,690. This price reflects the significant depreciation from new, making it a much more accessible luxury SUV. Prices can vary by a few thousand pounds depending on specific options, mileage, and condition, so be prepared to negotiate within a small range.

## Which trim to buy

The S Line trim is generally the sweet spot for the Q8. It comes with a sporty exterior styling package, larger alloy wheels (usually 21-inch), LED headlights, and a more dynamic interior with sport seats and the excellent Audi Virtual Cockpit. While there are higher trims like Black Edition and Vorsprung, the S Line offers a fantastic blend of desirable features, aesthetics, and value without pushing the price too high. The 50 TDI engine is the most popular diesel option, providing strong performance and decent efficiency for a large SUV.

## What to check before you buy

- MMI infotainment system glitches (software updates often fix these)
- Air suspension issues (if fitted, can be costly to repair)
- Diesel Particulate Filter (DPF) blockages (if mainly used for short journeys)
- Minor electrical gremlins
- Brake wear (heavy car, powerful engine)

## Running costs

Running an Audi Q8 50 TDI involves a few key costs. Fuel will be your biggest expense; at an average of 35 mpg and current diesel prices around £1.55/litre, you're looking at roughly 20.1 pence per mile. For 10,000 miles a year, that's about £2,010. Road tax (VED) for a 2021 model, which likely cost over £40,000 new, will be £580 per year until it's six years old (then £190). Insurance will vary greatly depending on your personal circumstances, but expect to pay in the region of £800-£1,500 annually. Servicing and maintenance for a premium Audi can also be higher than average, so factor that in.

## Key stats

- **Fuel Type**: Diesel
- **Horsepower**: 286 hp
- **Mpg**: 34-38 mpg (combined)
- **Reliability Score**: Good, but complex systems can be pricey to repair.
- **Safety Rating**: 5-star Euro NCAP (2019)

## Trim comparison

| Trim | Price new | Price used | Key features |
| --- | --- | --- | --- |
| S Line 50 TDI | £68,000 | £37,690 | 21-inch alloy wheels; S line exterior styling; LED headlights |
| Black Edition 50 TDI | £72,000 | £40,500 | All S Line features; Black styling package (grille, window surrounds, roof rails); 22-inch alloy wheels (usually) |
| Vorsprung 50 TDI | £88,000 | £52,000 | All Black Edition features; HD Matrix LED headlights; Panoramic glass sunroof |

## Depreciation forecast

| Year | Estimated value | Retention |
| --- | --- | --- |
| 2026 | £37,690 | 100% |
| 2027 | £33,500 | 89% |
| 2028 | £30,150 | 80% |
| 2029 | £27,436 | 73% |
| 2030 | £25,241 | 67% |

The Audi Q8, like many premium SUVs, experiences its steepest depreciation in the first three years. By 2026, a 2021 model will be around five years old, meaning the initial big drops in value have already occurred. This makes it a great time to buy, as you're getting a lot of car for a significantly reduced price. While it will continue to depreciate, the rate will be much slower, offering better value retention for your ownership period compared to buying a newer model.

Total value lost since new: 33%.

## Alternatives to consider

- [BMW X5](https://autoscout.fyi/cars/bmw-x5.md)
- [Mercedes-Benz GLE](https://autoscout.fyi/cars/mercedes-gle.md)
- [Range Rover Sport](https://autoscout.fyi/cars/range-rover-sport.md)

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