Audi S8 (2008)

Estimated running costs and MOT pass rates from 37 MOT tests in 2024.

Annual Cost

£3,153

£263/month

MOT Pass Rate

89%

Good

Road Tax

£790

Estimated/year

Est. Insurance

Grp 35-50

5204cc Petrol

Solid Option

89% pass rate, £3,153/year to run. 7 points above average.

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Petrol5204cc18 years old37 tests95k miles avg

Annual Running Costs

Fuel (Petrol, 5204cc)

~30 mpg

£1,958

Road Tax

Estimated CO2 band

£790

MOT Test

£55

Predicted Repairs

£350

Total per year£3,153

Per month£263/mo

Per week£61/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p 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.

Reliability Verdict

89% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's 7 points above the average of 82% across all models in our data.

89% of MOT tests on Audi S8s from 2008 ended in a pass in 2024, when they were about 16 years old. That's based on 37 tests across the UK, retests included. The average mileage recorded at those tests was 95,286 miles.

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How Does It Compare?

Rank among 2008 models69th of 566(top 13%)

Rank among Audi models760th of 1,066(bottom half)

vs average of all models+7%(82% avg)

vs 2008 models average+16%(73% avg)

vs Audi average-1%(90% avg)

Mileage Analysis

95,286

Average miles

118,400

Expected for age

The average 2008 Audi S8 had 95,286 miles on the clock at its 2024 MOT, which is in line with the expected 118,400 miles for a 16-year-old car, suggesting normal everyday use.

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Audi S8 by Year

Year	Pass Rate	Tests	Avg Mileage
2013	99%	87	87,380 mi
2008	89%	37	95,286 mi
2007	78%	68	92,767 mi
2002	82%	45	141,981 mi

Similar Cars to Consider

BMW X5

2010 · 4799cc Petrol

£3,153/year

86%

-3%

Audi A6

2009 · 4991cc Petrol

£3,153/year

81%

-8%

Mercedes ML

2006 · 4966cc Petrol

£3,153/year

80%

-9%

Mercedes SL

2008 · 5462cc Petrol

£3,003/year

90%

+1%

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About the 2008 Audi S8

The 2008 Audi S8 is a premium performance car. Our records list a 5204cc petrol engine, though engines vary between versions. 37 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 13% of all 2008 models for MOT pass rate.

With an average of 95,286 miles recorded at its 2024 MOT tests, Audi S8 owners drive about as much as the UK average.

2008 Audi S8 Fuel Costs

The 5204cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2008 Audi S8?

Total estimated annual running cost is £3,153 (£263/month), broken down as £1,958 fuel, £790 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 2008 Audi S8

At 18 years old, the Audi S8 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. Note: with only 37 tests in our data, these figures should be treated as indicative rather than definitive.

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.

Timing Chain / Belt

Watch out

At 18 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Medium risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

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 95k 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 2008 Audi S8 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 S8(2008)	89%	£1,958	£790	Grp 35-50	£3,153
BMW X5(2010)	86%	£1,958	£790	Grp 35-50	£3,153same
Audi A6(2009)	81%	£1,958	£790	Grp 35-50	£3,153same
Mercedes ML(2006)	80%	£1,958	£790	Grp 35-50	£3,153same
Mercedes SL(2008)	90%	£1,958	£790	Grp 35-50	£3,003-£150

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 2008 Audi S8

Is the 2008 Audi S8 reliable?

Good reliability. Occasional issues but generally solid. 89% of MOT tests on 2008 Audi S8s ended in a pass, from 37 tests (DVSA MOT data for tests in 2024, retests included). That's 7 points above the average of 82% across all models in the same data.

How much does a 2008 Audi S8 cost to run?

Our estimate is £3,153 a year (£263 a month): £1,958 fuel, £790 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2008 Audi S8?

89% of 37 MOT tests on the 2008 Audi S8 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 69th of 566 models first registered in 2008 (top 13%).

What is the average mileage for a 2008 Audi S8?

The average mileage recorded at MOT tests on the 2008 Audi S8 is 95,286 miles, which is in line with the expected 118,400 miles for a 16-year-old car, suggesting normal everyday use.