# Audi A8 — Used Car Buying Guide

AutoScout's analysis of the Audi A8 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-a8

## Verdict

- **Best value year**: 2021
- **Ideal trim**: Sport 50 TDI
- **Target mileage**: 30,000–50,000 miles
- **Max previous owners**: 2
- **Target price**: £28,773

## Why this model

The Audi A8 is a fantastic choice if you're looking for a luxurious, comfortable, and technologically advanced saloon without the new car price tag. It offers an incredibly smooth ride thanks to its standard air suspension, a beautifully crafted interior, and powerful yet refined engines. It's a lot of car for the money on the used market, making it a smart buy for long-distance cruising and executive comfort.

## What you should pay

Based on current UK market data for February 2026, a 2021 Audi A8 Sport 50 TDI with around 30-50k miles typically sells for around £28,773. Luxury saloons like the A8 depreciate heavily in their first few years, which is great news for used buyers. You're getting a car that cost upwards of £75,000 new for a fraction of the price, offering incredible value for money.

## Which trim to buy

The 'Sport 50 TDI' trim offers the best balance of luxury, performance, and value. The 50 TDI engine (3.0-litre V6 diesel) provides ample power and torque for effortless cruising, while still being reasonably economical for its size. The Sport trim comes with plenty of standard features like LED headlights, MMI Navigation Plus, Virtual Cockpit, and comfortable leather seats, giving you that premium feel without needing to stretch for the top-tier trims that often don't add much more practical value for the extra cost.

## What to check before you buy

- Air suspension failures (can be costly)
- MMI infotainment system glitches (software issues, screen freezing)
- Electrical gremlins (various sensor or module failures)
- DPF issues (for diesel models if not driven on long journeys regularly)
- Brake wear (heavy car, can go through pads/discs quickly)

## Running costs

Running an A8 isn't cheap, but it's manageable for a luxury car. For a 50 TDI diesel, you can expect around 38-40 mpg, which at current diesel prices (around £1.55/litre) works out to roughly 18.5 pence per mile. Road tax (VED) for a 2021 model will be £580 per year until it's six years old, then it drops to £190 per year. Insurance will be significant, likely in the range of £800-£1500+ annually depending on your personal circumstances. Servicing and maintenance will also be more expensive than a regular family car due to its complex engineering and premium parts.

## Key stats

- **Fuel Type**: Diesel
- **Horsepower**: 286 PS (282 bhp)
- **Mpg**: 38-40 mpg
- **Reliability Score**: Above Average
- **Safety Rating**: 5 stars (Euro NCAP 2017)

## Trim comparison

| Trim | Price new | Price used | Key features |
| --- | --- | --- | --- |
| Sport 50 TDI | £75,000 | £28,773 | LED headlights; MMI Navigation Plus with MMI Touch Response; Audi Virtual Cockpit |
| S Line 50 TDI | £80,000 | £31,500 | Matrix LED headlights; S Line exterior styling (sportier bumpers, side skirts); 20-inch alloy wheels |
| Vorsprung 50 TDI | £95,000 | £38,000 | OLED rear lights; Panoramic glass sunroof; Bang & Olufsen 3D Sound System |

## Depreciation forecast

| Year | Estimated value | Retention |
| --- | --- | --- |
| 2026 | £28,773 | 0% |
| 2027 | £24,000 | 16.5% |
| 2028 | £19,500 | 18.75% |
| 2029 | £16,000 | 17.9% |
| 2030 | £13,000 | 18.75% |

The Audi A8 has already taken its biggest depreciation hit in its early years, making it an excellent used buy right now. While it will continue to lose value, the rate of depreciation slows down significantly after the initial drop. Buying a 3-5 year old model means you're letting the first owner absorb the steepest part of the curve, offering you a luxurious car at a much more accessible price point. However, be aware that luxury cars, especially diesels, will continue to depreciate steadily.

Total value lost since new: 54.8%.

## Alternatives to consider

- [BMW 7 Series](https://autoscout.fyi/cars/bmw-7-series.md)
- [Mercedes-Benz S-Class](https://autoscout.fyi/cars/mercedes-s-class.md)
- [Lexus LS](https://autoscout.fyi/cars/lexus-ls.md)

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