# Audi A4 — Used Car Buying Guide

AutoScout's analysis of the Audi A4 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-a4

## Verdict

- **Best value year**: 2020
- **Ideal trim**: S Line
- **Target mileage**: 40,000–50,000 miles
- **Max previous owners**: 2
- **Target price**: £18,375

## Why this model

The Audi A4 is a fantastic choice if you're looking for a premium saloon that offers a great blend of comfort, style, and driving dynamics. It feels really well-built inside, with high-quality materials and a sophisticated design. The engines are generally efficient and punchy, and it's a very comfortable car for both short trips and long motorway journeys. It's a solid step up from mainstream brands without being overly flashy.

## What you should pay

Based on current UK market data for February 2026, a 2020 Audi A4 S Line 35 TFSI with around 40,000-50,000 miles should be priced around £18,375. Prices can vary slightly based on specific options, condition, and exact mileage, but this is a strong benchmark. You might find some slightly cheaper if they have higher mileage or fewer desirable options, or a bit more for lower mileage or a more powerful engine.

## Which trim to buy

The S Line trim is definitely the sweet spot for the A4. It gives you all the sporty looks with a more aggressive bumper, side skirts, and larger alloy wheels, making it look much more desirable than the entry-level models. Inside, you get sport seats, a perforated leather steering wheel, and often a more advanced infotainment system. Crucially, it doesn't come with a massive price premium over the Sport trim on the used market, making it excellent value for money. You get that premium feel and look without breaking the bank.

## What to check before you buy

- Water pump leaks (can be costly if not caught early)
- S-Tronic gearbox mechatronic issues (less common on newer models but check service history for gearbox fluid changes)
- MMI software glitches (often resolved with updates)
- DPF issues on diesel models if not driven long distances regularly

## Running costs

For a 35 TFSI petrol model, expect real-world fuel economy of 30-34 mpg. At current petrol prices (around £1.45/litre or £6.59/gallon), this works out to roughly 19-22 pence per mile. Road tax (VED) for a 2020 model will be £180 per year. Insurance costs will vary widely based on your age, location, and driving history, but expect it to be moderate for a premium brand car, likely in the £600-£1000 range annually for a typical driver.

## Key stats

- **Fuel Type**: Petrol
- **Horsepower**: 150hp
- **Mpg**: 30-34 mpg
- **Reliability Score**: Good
- **Safety Rating**: 5 stars (Euro NCAP 2015)

## Trim comparison

| Trim | Price new | Price used | Key features |
| --- | --- | --- | --- |
| SE | £30,000 | £16,000 | 17-inch alloy wheels; LED headlights; MMI Radio Plus with 7-inch colour display |
| Sport | £32,500 | £17,500 | 18-inch alloy wheels; Sport suspension; Sport seats |
| S Line | £35,000 | £18,375 | 19-inch alloy wheels; S Line exterior styling (sport bumpers, side skirts); LED headlights with dynamic rear indicators |

## Depreciation forecast

| Year | Estimated value | Retention |
| --- | --- | --- |
| 2026 | £18,375 | 0% |
| 2027 | £16,170 | 12% |
| 2028 | £14,332 | 22% |
| 2029 | £12,495 | 32% |
| 2030 | £10,657 | 42% |

Buying an Audi A4 at 3-4 years old, like a 2020 model, is often the sweet spot. The steepest part of its depreciation curve has already passed, meaning you're letting the first owner take the biggest hit. While it will continue to lose value, the rate of loss slows down significantly. This means you get a premium car at a much more accessible price point, and when you come to sell it in a few years, you won't see as dramatic a percentage drop as if you'd bought it new.

Total value lost since new: 42%.

## Alternatives to consider

- [BMW 3 Series](https://autoscout.fyi/cars/bmw-3-series.md)
- [Mercedes-Benz C-Class](https://autoscout.fyi/cars/mercedes-c-class.md)
- [Skoda Superb](https://autoscout.fyi/cars/skoda-superb.md)

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