AUDI A8 S LINE BLK ED 50 TDI QUAT A (2021)
Running costs, common problems, and reliability data based on 78 real MOT tests in 2024.
MOT Pass Rate
91%
Total Tests (2024)
78
Avg Mileage
37,672 mi
Est. Annual Cost
£1,690
Is the 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A reliable?
Excellent reliability. Very few MOT failures. That's 9 points above the national average of 82%.
At 3 years old, 91% of AUDI A8 S LINE BLK ED 50 TDI QUAT As from 2021 passed their MOT first time in 2024. That's based on 78 tests across the UK. The average mileage at this age is 37,672 miles.
How does the 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A compare?
Mileage Analysis
The average 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A has 37,672 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.
Best year to buy a AUDI A8 S LINE BLK ED 50 TDI QUAT A?
The most reliable year is the 2020 model with a 95% MOT pass rate, while the 2021 model has the lowest at 91%. Consider a different year if reliability is a priority.
How much does a 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT 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.
AUDI A8 S LINE BLK ED 50 TDI QUAT A by Year
Checking a specific AUDI A8 S LINE BLK ED 50 TDI QUAT A?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A
The 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A is a premium performance with a 2967cc diesel engine. 78 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 37,672 miles at 3 years old, AUDI A8 S LINE BLK ED 50 TDI QUAT 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 BLK ED 50 TDI QUAT 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 BLK ED 50 TDI QUAT A?
Total estimated annual running cost is £1,690 (£141/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 91% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT 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 78 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2021 AUDI A8 S LINE BLK ED 50 TDI QUAT A
If reliability is your priority, there's one similar car with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (-1%) from 41,000 tests
- FORD RANGER (2019) 87% pass rate (-4%) from 32,194 tests
- AUDI Q5 (2019) 93% pass rate (+2%) from 24,241 tests
- AUDI A5 (2019) 90% pass rate (-1%) from 22,290 tests