Is the 2015 AUDI A8 reliable?

Excellent reliability. Very few MOT failures. 93% of AUDI A8s from 2015 passed their MOT first time in 2026, based on 2,300 tests. That's 11 points above the national average of 82%.

How much does a 2015 AUDI A8 cost to run?

Estimated annual running cost is £1,895 (£158/month), including £1245 fuel, £395 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2015 AUDI A8?

The 2015 AUDI A8 has a 93% MOT pass rate based on 2,300 tests in 2026. This ranks 103 out of 559 cars from 2015.

Which year AUDI A8 is most reliable?

The 2021 AUDI A8 has the highest MOT pass rate at 98%. The least reliable year is 2000 at 77%.

What is the average mileage for a 2015 AUDI A8?

The average mileage for a 2015 AUDI A8 is 85,475 miles, which is in line with the expected 81,400 miles for a 11-year-old car, suggesting normal everyday use.

AUDI A8 (2015)

Running costs, reliability data, and common problems from 2,300 real MOT tests.

Annual Cost

£1,895

£158/month

MOT Pass Rate

93%

Excellent

Road Tax

£395

Based on CC/year

Insurance

Grp 30-42

2967cc Diesel

Great Choice

93% pass rate, £1895/year to run. 11 points above average.

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Diesel2967cc11 years old2,300 tests85k miles avg

Annual Running Costs

Fuel (Diesel, 2967cc)

~40 mpg

£1,245

Road Tax

Based on 2967cc

£395

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,895

Per month£158/mo

Per week£36/wk

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

93% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 11 points above the national average of 82%.

At 11 years old, 93% of AUDI A8s from 2015 passed their MOT first time in 2026. That's based on 2,300 tests across the UK. The average mileage at this age is 85,475 miles.

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How Does It Compare?

Rank among 2015 cars103th of 559(top 18%)

Rank among AUDI models415th of 1,079(top 38%)

vs national average+11%(82% avg)

vs 2015 cars average+10%(83% avg)

vs AUDI average+3%(90% avg)

Mileage Analysis

85,475

Average miles

81,400

Expected for age

The average 2015 AUDI A8 has 85,475 miles on the clock, which is in line with the expected 81,400 miles for a 11-year-old car, suggesting normal everyday use.

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Best Year to Buy?

The most reliable year is the 2021 model with a 98% MOT pass rate, while the 2000 model has the lowest at 77%. The 2015 sits between the two at 93%.

AUDI A8 by Year

Year	Pass Rate	Tests	Avg Mileage
2021	98%	170	35,071 mi
2020	96%	599	39,317 mi
2019	95%	1,932	50,413 mi
2018	95%	2,387	59,736 mi
2017	95%	1,392	72,207 mi
2016	94%	1,876	80,025 mi
2015	93%	2,300	85,475 mi
2014	94%	1,889	98,201 mi
2013	91%	1,562	108,280 mi
2012	92%	1,468	113,405 mi
2011	93%	1,392	120,960 mi
2010	87%	933	124,272 mi
2009	89%	735	138,957 mi
2008	87%	1,332	140,305 mi
2007	86%	1,124	147,303 mi
2006	85%	748	146,966 mi
2005	87%	661	142,434 mi
2004	80%	349	134,086 mi
2003	84%	223	134,224 mi
2002	84%	166	137,356 mi
2001	85%	157	141,044 mi
2000	77%	104	143,697 mi
1999	80%	192	140,354 mi
1998	80%	122	136,028 mi
1997	79%	115	131,393 mi
1996	74%	31	135,336 mi

Similar Cars to Consider

AUDI A5

2017 · 2967cc Diesel

£1,840/year

89%

-4%

MERCEDES GLC

2017 · 2987cc Diesel

£1,690/year

90%

-3%

LAND ROVER RANGE ROVER

2013 · 2926cc Diesel

£1,900/year

88%

-5%

JAGUAR XF

2014 · 2993cc Diesel

£1,900/year

84%

-9%

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About the 2015 AUDI A8

The 2015 AUDI A8 is a premium performance with a 2967cc diesel engine. 2,300 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. It ranks in the top 18% of all 2015 cars for reliability.

With an average of 85,475 miles at 11 years old, AUDI A8 owners drive about as much as the UK average.

2015 AUDI A8 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). 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 2015 AUDI A8?

Total estimated annual running cost is £1,895 (£158/month), broken down as £1245 fuel, £395 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 93% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

AUDI A8 Reliability Trend

Newer AUDI A8s show better MOT pass rates than older ones, with an average improvement of 10 percentage points.

Buying a Used 2015 AUDI A8

At 11 years old, the AUDI A8 is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2021 model has the highest pass rate at 98%.

Common Issues to Watch For

Based on the 2015 AUDI A8's fuel type, age, and engine size, these are the most likely problem areas to check.

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

Watch out

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

Watch out

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

Dual Mass Flywheel

Watch out

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

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Clutch Wear

Medium risk

With an average of 85k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

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 2015 AUDI A8 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
AUDI A8(2015)	93%	£1245	£395	Grp 30-42	£1895
AUDI A5(2017)	89%	£1245	£190	Grp 30-42	£1840-£55
MERCEDES GLC(2017)	90%	£1245	£190	Grp 30-42	£1690-£205
LAND ROVER RANGE ROVER(2013)	88%	£1245	£250	Grp 30-42	£1900+£5
JAGUAR XF(2014)	84%	£1245	£250	Grp 30-42	£1900+£5

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.