AUDI A8 S LINE 50TDI MHEV QUATTRO A (2021)
Running costs, common problems, and reliability data based on 30 real MOT tests in 2024.
MOT Pass Rate
87%
Total Tests (2024)
30
Avg Mileage
33,546 mi
Est. Annual Cost
£1,840
Is the 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A reliable?
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 3 years old, 87% of AUDI A8 S LINE 50TDI MHEV QUATTRO As from 2021 passed their MOT first time in 2024. That's based on 30 tests across the UK. The average mileage at this age is 33,546 miles.
How does the 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A compare?
Mileage Analysis
The average 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A has 33,546 miles on the clock, which is well above the expected 22,200 miles for a 3-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
How much does a 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
Checking a specific AUDI A8 S LINE 50TDI MHEV QUATTRO A?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A
The 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A is a premium performance with a 2967cc diesel engine. 30 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 90% of 2021 cars for MOT pass rates.
With an average of 33,546 miles at 3 years old, AUDI A8 S LINE 50TDI MHEV QUATTRO A owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A Fuel Costs
The 2967cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A?
Total estimated annual running cost is £1,840 (£153/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. Note: with only 30 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2021 AUDI A8 S LINE 50TDI MHEV QUATTRO A
If reliability is your priority, there are 3 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (+3%) from 41,000 tests
- FORD RANGER (2019) 87% pass rate (same) from 32,194 tests
- AUDI Q5 (2019) 93% pass rate (+6%) from 24,241 tests
- AUDI A5 (2019) 90% pass rate (+3%) from 22,290 tests