Audi A8 Black Ed 50 TDI MHEV Quat A (2021)

Estimated running costs and MOT pass rates from 115 MOT tests in 2024.

Annual Cost

£2,131

£178/month

MOT Pass Rate

91%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 30-42

2967cc Diesel

Great Choice

91% pass rate, £2,131/year to run. 9 points above average.

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Diesel2967cc5 years old115 tests32k miles avg

Annual Running Costs

Fuel (Diesel, 2967cc)

~40 mpg

£1,676

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,131

Per month£178/mo

Per week£41/wk

Estimates based on 7,400 miles/year (UK average), diesel at 199.33p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

91% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 9 points above the average of 82% across all models in our data.

91% of MOT tests on Audi A8 Black Ed 50 TDI MHEV Quat As from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 115 tests across the UK, retests included. The average mileage recorded at those tests was 32,175 miles.

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How Does It Compare?

Rank among 2021 models2341st of 3,336(bottom half)

Rank among Audi models651st of 1,066(bottom half)

vs average of all models+9%(82% avg)

vs 2021 models average-1%(92% avg)

vs Audi average+1%(90% avg)

Mileage Analysis

32,175

Average miles

22,200

Expected for age

The average 2021 Audi A8 Black Ed 50 TDI MHEV Quat A had 32,175 miles on the clock at its 2024 MOT, which is above the expected 22,200 miles for a 3-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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Audi A8 Black Ed 50 TDI MHEV Quat A by Year

Year	Pass Rate	Tests	Avg Mileage
2022	92%	37	20,992 mi
2021	91%	115	32,175 mi

Similar Cars to Consider

Mercedes E

2019 · 2925cc Diesel

£2,131/year

90%

-1%

Ford Ranger

2019 · 3198cc Diesel

£2,281/year

87%

-4%

Audi Q5

2019 · 2967cc Diesel

£2,131/year

93%

+2%

Audi A5

2019 · 2967cc Diesel

£2,131/year

90%

-1%

Check a Specific Audi A8 Black Ed 50 TDI MHEV Quat A

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About the 2021 Audi A8 Black Ed 50 TDI MHEV Quat A

The 2021 Audi A8 Black Ed 50 TDI MHEV Quat A is a premium performance car. Our records list a 2967cc diesel engine, though engines vary between versions. 115 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. Among all models from 2021, the average MOT pass rate is 92%, and this model falls short of that benchmark.

With an average of 32,175 miles recorded at its 2024 MOT tests, Audi A8 Black Ed 50 TDI MHEV Quat A owners cover more miles than the average driver.

2021 Audi A8 Black Ed 50 TDI MHEV 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 £1,676 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; 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 2021 Audi A8 Black Ed 50 TDI MHEV Quat A?

Total estimated annual running cost is £2,131 (£178/month), broken down as £1,676 fuel, £200 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 Black Ed 50 TDI MHEV Quat A

At 5 years old, the Audi A8 Black Ed 50 TDI MHEV Quat 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

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Medium risk

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Low risk

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Medium risk

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

Service History

Low risk

Always 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 2021 Audi A8 Black Ed 50 TDI MHEV Quat A stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Audi A8 Black Ed 50 TDI MHEV Quat A(2021)	91%	£1,676	£200	Grp 30-42	£2,131
Mercedes E(2019)	90%	£1,676	£200	Grp 30-42	£2,131same
Ford Ranger(2019)	87%	£1,676	£200	Grp 35-50	£2,281+£150
Audi Q5(2019)	93%	£1,676	£200	Grp 30-42	£2,131same
Audi A5(2019)	90%	£1,676	£200	Grp 30-42	£2,131same

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2021 Audi A8 Black Ed 50 TDI MHEV Quat A

Is the 2021 Audi A8 Black Ed 50 TDI MHEV Quat A reliable?

Excellent reliability. Very few MOT failures. 91% of MOT tests on 2021 Audi A8 Black Ed 50 TDI MHEV Quat As ended in a pass, from 115 tests (DVSA MOT data for tests in 2024, retests included). That's 9 points above the average of 82% across all models in the same data.

How much does a 2021 Audi A8 Black Ed 50 TDI MHEV Quat A cost to run?

Our estimate is £2,131 a year (£178 a month): £1,676 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2021 Audi A8 Black Ed 50 TDI MHEV Quat A?

91% of 115 MOT tests on the 2021 Audi A8 Black Ed 50 TDI MHEV Quat A ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 2341st of 3,336 models first registered in 2021 (bottom half).

What is the average mileage for a 2021 Audi A8 Black Ed 50 TDI MHEV Quat A?

The average mileage recorded at MOT tests on the 2021 Audi A8 Black Ed 50 TDI MHEV Quat A is 32,175 miles, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.