Audi S6 (2008)

Estimated running costs and MOT pass rates from 41 MOT tests in 2024.

Annual Cost

£3,153

£263/month

MOT Pass Rate

83%

Good

Road Tax

£790

Estimated/year

Est. Insurance

Grp 35-50

5204cc Petrol

Solid Option

83% pass rate, £3,153/year to run. Close to the average across all models.

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Petrol5204cc18 years old41 tests101k 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

83% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the Audi brand average of 90%.

83% of MOT tests on Audi S6s from 2008 ended in a pass in 2024, when they were about 16 years old. That's based on 41 tests across the UK, retests included. The average mileage recorded at those tests was 101,397 miles.

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How Does It Compare?

Rank among 2008 models150th of 566(top half)

Rank among Audi models917th of 1,066(bottom 15%)

vs average of all models+1%(82% avg)

vs 2008 models average+10%(73% avg)

vs Audi average-7%(90% avg)

Mileage Analysis

101,397

Average miles

118,400

Expected for age

The average 2008 Audi S6 had 101,397 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 S6 by Year

Year	Pass Rate	Tests	Avg Mileage
2014	89%	36	78,960 mi
2013	96%	79	93,087 mi
2008	83%	41	101,397 mi
2007	84%	51	109,485 mi
2006	87%	63	126,176 mi

Similar Cars to Consider

BMW X5

2010 · 4799cc Petrol

£3,153/year

86%

+3%

Audi A6

2009 · 4991cc Petrol

£3,153/year

81%

-2%

Mercedes ML

2006 · 4966cc Petrol

£3,153/year

80%

-3%

Mercedes SL

2008 · 5462cc Petrol

£3,003/year

90%

+7%

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About the 2008 Audi S6

The 2008 Audi S6 is a premium performance car. Our records list a 5204cc petrol engine, though engines vary between versions. 41 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. Among all models from 2008, the average MOT pass rate is 73%, and this model beats that benchmark.

With an average of 101,397 miles recorded at its 2024 MOT tests, Audi S6 owners drive about as much as the UK average.

2008 Audi S6 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 S6?

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 83% pass rate. Keeping on top of servicing will help avoid surprises.

Buying a Used 2008 Audi S6

At 18 years old, the Audi S6 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 41 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

Watch out

With an average of 101k 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 S6 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 S6(2008)	83%	£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 S6

Is the 2008 Audi S6 reliable?

Good reliability. Occasional issues but generally solid. 83% of MOT tests on 2008 Audi S6s ended in a pass, from 41 tests (DVSA MOT data for tests in 2024, retests included). That's 1 point above the average of 82% across all models in the same data.

How much does a 2008 Audi S6 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 S6?

83% of 41 MOT tests on the 2008 Audi S6 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 150th of 566 models first registered in 2008 (top half).

What is the average mileage for a 2008 Audi S6?

The average mileage recorded at MOT tests on the 2008 Audi S6 is 101,397 miles, which is in line with the expected 118,400 miles for a 16-year-old car, suggesting normal everyday use.