AUDI A4 S LINE 30 TDI S-A (2020)
Running costs, reliability data, and common problems from 274 real MOT tests.
Annual Cost
£1,637
£136/month
MOT Pass Rate
89%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1968cc Diesel
Solid Option
89% pass rate, £1637/year to run. 7 points above average.
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Annual Running Costs
~48 mpg
Flat rate (post-2017)
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Good reliability. Occasional issues but generally solid. That's 7 points above the national average of 82%.
At 6 years old, 89% of AUDI A4 S LINE 30 TDI S-As from 2020 passed their MOT first time in 2026. That's based on 274 tests across the UK. The average mileage at this age is 54,187 miles.
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Mileage Analysis
54,187
Average miles
44,400
Expected for age
The average 2020 AUDI A4 S LINE 30 TDI S-A has 54,187 miles on the clock, which is above the expected 44,400 miles for a 6-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
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About the 2020 AUDI A4 S LINE 30 TDI S-A
The 2020 AUDI A4 S LINE 30 TDI S-A is a premium with a 1968cc diesel engine. 274 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It sits in the bottom 77% of 2020 cars for MOT pass rates.
With an average of 54,187 miles at 6 years old, AUDI A4 S LINE 30 TDI S-A owners cover more miles than the average driver.
2020 AUDI A4 S LINE 30 TDI S-A Fuel Costs
The 1968cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2020 AUDI A4 S LINE 30 TDI S-A?
Total estimated annual running cost is £1,637 (£136/month), broken down as £1037 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2020 AUDI A4 S LINE 30 TDI S-A
At 6 years old, the AUDI A4 S LINE 30 TDI S-A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Common Issues to Watch For
Based on the 2020 AUDI A4 S LINE 30 TDI S-A's fuel type, age, and engine size, these are the most likely problem areas to check.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Watch outExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2020 AUDI A4 S LINE 30 TDI S-A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| AUDI A4 S LINE 30 TDI S-A(2020) | 89% | £1037 | £195 | Grp 18-32 | £1637 |
| VOLKSWAGEN GOLF(2018) | 92% | £1037 | £190 | Grp 18-32 | £1482-£155 |
| FORD FOCUS(2019) | 89% | £905 | £190 | Grp 12-25 | £1500-£137 |
| VOLKSWAGEN POLO(2018) | 84% | £905 | £190 | Grp 12-25 | £1500-£137 |
| FORD KUGA(2019) | 91% | £1037 | £190 | Grp 18-32 | £1482-£155 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Audi Models
Explore other Audi cars or similar models in the same category.
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VOLKSWAGEN GOLF
2018 · 1968cc Diesel
FORD FOCUS
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VOLKSWAGEN POLO
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