Mercedes C 320 (2008)

Estimated running costs and MOT pass rates from 699 MOT tests in 2024.

Annual Cost

£2,641

£220/month

MOT Pass Rate

77%

Average

Road Tax

£410

Estimated/year

Est. Insurance

Grp 30-42

2987cc Diesel

Check Carefully

77% pass rate, £2,641/year to run. 5 points below average.

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Diesel2987cc18 years old699 tests126k miles avg

Annual Running Costs

Fuel (Diesel, 2987cc)

~40 mpg

£1,676

Road Tax

Estimated CO2 band

£410

MOT Test

£55

Predicted Repairs

£500

Total per year£2,641

Per month£220/mo

Per week£51/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.

Reliability Verdict

77% MOT pass rate(Average)

0%All-model avg: 82%100%

Average reliability. Expect some repairs as it ages. That's close to the average of 82% across all models in our data. It falls below the Mercedes brand average of 87%.

77% of MOT tests on Mercedes C 320s from 2008 ended in a pass in 2024, when they were about 16 years old. That's based on 699 tests across the UK, retests included. The average mileage recorded at those tests was 126,482 miles.

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How Does It Compare?

Rank among 2008 models265th of 566(top half)

Rank among Mercedes models1178th of 1,376(bottom 15%)

vs average of all models-5%(82% avg)

vs 2008 models average+4%(73% avg)

vs Mercedes average-10%(87% avg)

Mileage Analysis

126,482

Average miles

118,400

Expected for age

The average 2008 Mercedes C 320 had 126,482 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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Best Year to Buy?

Of the years with at least 100 tests, the 2007 model has the highest MOT pass rate at 82%, while the 2002 model has the lowest at 72%. The 2008 scores 77%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Mercedes C 320 by Year

Year	Pass Rate	Tests	Avg Mileage
2010	80%	35	137,998 mi
2009	76%	311	121,062 mi
2008	77%	699	126,482 mi
2007	82%	301	116,931 mi
2006	78%	269	123,701 mi
2005	77%	175	122,264 mi
2004	72%	199	104,785 mi
2003	78%	197	109,037 mi
2002	72%	178	107,506 mi
2001	79%	200	104,888 mi
2000	89%	38	103,507 mi

Similar Cars to Consider

BMW 3 Series

2008 · 2926cc Diesel

£2,491/year

80%

+3%

Audi A5

2010 · 2967cc Diesel

£2,491/year

82%

+5%

Jaguar XF

2010 · 2993cc Diesel

£2,491/year

80%

+3%

Land Rover Discovery

2006 · 2495cc Diesel

£2,641/year

78%

+1%

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About the 2008 Mercedes C 320

The 2008 Mercedes C 320 is a premium performance car. Our records list a 2987cc diesel engine, though engines vary between versions. 699 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. Among all models from 2008, the average MOT pass rate is 73%, and this model beats that benchmark.

With an average of 126,482 miles recorded at its 2024 MOT tests, Mercedes C 320 owners drive about as much as the UK average.

2008 Mercedes C 320 Fuel Costs

The 2987cc 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 2008 Mercedes C 320?

Total estimated annual running cost is £2,641 (£220/month), broken down as £1,676 fuel, £410 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 77% pass rate. Keeping on top of servicing will help avoid surprises.

Mercedes C 320 Reliability Trend

The Mercedes C 320 has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.

Buying a Used 2008 Mercedes C 320

At 18 years old, the Mercedes C 320 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 2007 model has the highest pass rate at 82%.

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

Watch out

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

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

Watch out

With an average of 126k 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.

Engine Mounts

Medium risk

Worn engine mounts cause excessive vibration and movement. Replacement costs £150-£400 per mount. Check for vibration at idle with the bonnet open.

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 Mercedes C 320 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
Mercedes C 320(2008)	77%	£1,676	£410	Grp 30-42	£2,641
BMW 3 Series(2008)	80%	£1,676	£410	Grp 30-42	£2,491-£150
Audi A5(2010)	82%	£1,676	£410	Grp 30-42	£2,491-£150
Jaguar XF(2010)	80%	£1,676	£410	Grp 30-42	£2,491-£150
Land Rover Discovery(2006)	78%	£1,676	£410	Grp 25-38	£2,641same

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 Mercedes C 320

Is the 2008 Mercedes C 320 reliable?

Average reliability. Expect some repairs as it ages. 77% of MOT tests on 2008 Mercedes C 320s ended in a pass, from 699 tests (DVSA MOT data for tests in 2024, retests included). That's 5 points below the average of 82% across all models in the same data.

How much does a 2008 Mercedes C 320 cost to run?

Our estimate is £2,641 a year (£220 a month): £1,676 fuel, £410 road tax, £55 MOT and £500 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2008 Mercedes C 320?

77% of 699 MOT tests on the 2008 Mercedes C 320 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 265th of 566 models first registered in 2008 (top half).

Which year Mercedes C 320 has the best MOT pass rate?

Of the years with at least 100 tests, the 2007 Mercedes C 320 has the highest MOT pass rate at 82% and the 2002 the lowest at 72%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2008 Mercedes C 320?

The average mileage recorded at MOT tests on the 2008 Mercedes C 320 is 126,482 miles, which is in line with the expected 118,400 miles for a 16-year-old car, suggesting normal everyday use.