How much does a 2004 MERCEDES 320 cost to run?

Estimated annual running cost is £2,535 (£211/month), including £1245 fuel, £735 road tax, £55 MOT, and £500 predicted repairs.

What is the MOT pass rate for a 2004 MERCEDES 320?

The 2004 MERCEDES 320 has a 78% MOT pass rate based on 45 tests in 2026. This ranks 167 out of 491 cars from 2004.

Which year MERCEDES 320 is most reliable?

The 1994 MERCEDES 320 has the highest MOT pass rate at 91%. The least reliable year is 2009 at 71%.

MERCEDES 320 (2004)

Q: Is the 2004 MERCEDES 320 reliable?

Average reliability. Expect some repairs as it ages. 78% of MERCEDES 320s from 2004 passed their MOT first time in 2026, based on 45 tests. That's 4 points below the national average of 82%.

Q: What is the average mileage for a 2004 MERCEDES 320?

The average mileage for a 2004 MERCEDES 320 is 113,945 miles, which is below the expected 162,800 miles for a 22-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Running costs, reliability data, and common problems from 45 real MOT tests.

Annual Cost

£2,535

£211/month

MOT Pass Rate

78%

Average

Road Tax

£735

Based on CC/year

Insurance

Grp 35-50

3199cc Diesel

Check Carefully

78% pass rate, £2535/year to run. Close to the national average.

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Diesel3199cc22 years old45 tests114k miles avg

Annual Running Costs

Fuel (Diesel, 3199cc)

~40 mpg

£1,245

Road Tax

Based on 3199cc

£735

MOT Test

£55

Predicted Repairs

£500

Total per year£2,535

Per month£211/mo

Per week£49/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

78% MOT pass rate(Average)

0%National avg: 82%100%

Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.

At 22 years old, 78% of MERCEDES 320s from 2004 passed their MOT first time in 2026. That's based on 45 tests across the UK. The average mileage at this age is 113,945 miles.

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How Does It Compare?

Rank among 2004 cars167th of 491(top 34%)

Rank among MERCEDES models1189th of 1,408(top 84%)

vs national average-4%(82% avg)

vs 2004 cars average+6%(72% avg)

vs MERCEDES average-9%(87% avg)

Mileage Analysis

113,945

Average miles

162,800

Expected for age

The average 2004 MERCEDES 320 has 113,945 miles on the clock, which is below the expected 162,800 miles for a 22-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Best Year to Buy?

The most reliable year is the 1994 model with a 91% MOT pass rate, while the 2009 model has the lowest at 71%. The 2004 sits between the two at 78%.

MERCEDES 320 by Year

Year	Pass Rate	Tests	Avg Mileage
2009	71%	72	117,144 mi
2008	75%	115	121,055 mi
2007	84%	148	128,327 mi
2006	78%	181	118,117 mi
2005	72%	58	125,364 mi
2004	78%	45	113,945 mi
2001	70%	37	99,359 mi
2000	74%	39	92,550 mi
1999	87%	31	120,105 mi
1994	91%	66	90,618 mi
1993	84%	376	120,168 mi
1992	88%	34	138,038 mi

Similar Cars to Consider

BMW 3 SERIES

2005 · 2926cc Diesel

£2,050/year

78%

same

LAND ROVER RANGE ROVER SPORT

2006 · 2720cc Diesel

£1,900/year

81%

+3%

FORD MONDEO

2005 · 2967cc Diesel

£2,250/year

69%

-9%

FIAT DUCATO

2005 · 2988cc Diesel

£2,050/year

77%

-1%

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About the 2004 MERCEDES 320

The 2004 MERCEDES 320 is a performance with a 3199cc diesel engine. 45 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2004, the average MOT pass rate is 72%, and this model beats that benchmark.

With an average of 113,945 miles at 22 years old, MERCEDES 320 owners tend to use this car less than the typical driver.

2004 MERCEDES 320 Fuel Costs

The 3199cc 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 2004 MERCEDES 320?

Total estimated annual running cost is £2,535 (£211/month), broken down as £1245 fuel, £735 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 78% pass rate. Keeping on top of servicing will help avoid surprises.

MERCEDES 320 Reliability Trend

Older MERCEDES 320s tend to have better MOT pass rates than newer ones, with an average decline of 5 percentage points across model years.

Buying a Used 2004 MERCEDES 320

At 22 years old, the MERCEDES 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 1994 model has the highest pass rate at 91%. Note: with only 45 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 2004 MERCEDES 320'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.

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 114k 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 2004 MERCEDES 320 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES 320(2004)	78%	£1245	£735	Grp 35-50	£2535
BMW 3 SERIES(2005)	78%	£1245	£250	Grp 30-42	£2050-£485
LAND ROVER RANGE ROVER SPORT(2006)	81%	£1245	£250	Grp 30-42	£1900-£635
FORD MONDEO(2005)	69%	£1245	£250	Grp 30-42	£2250-£285
FIAT DUCATO(2005)	77%	£1245	£250	Grp 30-42	£2050-£485

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.