Mercedes 310 (1994)

Estimated running costs and MOT pass rates from 57 MOT tests in 2024.

Annual Cost

£2,806

£234/month

MOT Pass Rate

54%

Below Avg

Road Tax

£375

Estimated/year

Est. Insurance

Grp 30-42

2874cc Diesel

Proceed With Caution

54% pass rate, £2,806/year to run. 28 points below average.

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Diesel2874cc32 years old57 tests116k miles avg

Annual Running Costs

Fuel (Diesel, 2874cc)

~40 mpg

£1,676

Road Tax

Pre-2001 engine size rate

£375

MOT Test

£55

Predicted Repairs

Higher estimate due to low pass rate

£700

Total per year£2,806

Per month£234/mo

Per week£54/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

54% MOT pass rate(Below Avg)

0%All-model avg: 82%100%

Below average reliability. Budget extra for maintenance and repairs. That's 28 points below the average of 82% across all models in our data. It falls below the Mercedes brand average of 87%.

54% of MOT tests on Mercedes 310s from 1994 ended in a pass in 2024, when they were about 30 years old. That's based on 57 tests across the UK, retests included. The average mileage recorded at those tests was 115,979 miles.

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How Does It Compare?

Rank among 1994 models200th of 204(bottom 3%)

Rank among Mercedes models1374th of 1,376(bottom 1%)

vs average of all models-28%(82% avg)

vs 1994 models average-22%(76% avg)

vs Mercedes average-33%(87% avg)

Mileage Analysis

115,979

Average miles

222,000

Expected for age

The average 1994 Mercedes 310 had 115,979 miles on the clock at its 2024 MOT, which is below the expected 222,000 miles for a 30-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Mercedes 310 by Year

Year	Pass Rate	Tests	Avg Mileage
1995	66%	50	112,252 mi
1994	54%	57	115,979 mi

Similar Cars to Consider

Land Rover Defender

1995 · 2500cc Diesel

£2,606/year

74%

+20%

Volvo 800 Series

1996 · 2460cc Diesel

£2,606/year

74%

+20%

Land Rover Discovery

1996 · 2497cc Diesel

£2,606/year

78%

+24%

Talbot Express

1993 · 2500cc Diesel

£2,806/year

66%

+12%

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About the 1994 Mercedes 310

The 1994 Mercedes 310 is a premium performance car. Our records list a 2874cc diesel engine, though engines vary between versions. 57 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It sits in the bottom 3% of 1994 models for MOT pass rate.

With an average of 115,979 miles recorded at its 2024 MOT tests, Mercedes 310 owners tend to use this car less than the typical driver.

1994 Mercedes 310 Fuel Costs

The 2874cc 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 1994 Mercedes 310?

Total estimated annual running cost is £2,806 (£234/month), broken down as £1,676 fuel, £375 road tax, £55 MOT, and £700 predicted repairs. The higher repair estimate reflects the 54% MOT pass rate. Cars in this bracket tend to need work on suspension, brakes, and emissions components.

Buying a Used 1994 Mercedes 310

At 32 years old, the Mercedes 310 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 57 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.

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 116k 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.

Higher Than Average Failure Rate

Watch out

With a 54% MOT pass rate, this model fails more often than most. Budget for unexpected repairs and get a thorough pre-purchase inspection.

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 1994 Mercedes 310 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 310(1994)	54%	£1,676	£375	Grp 30-42	£2,806
Land Rover Defender(1995)	74%	£1,676	£375	Grp 25-38	£2,606-£200
Volvo 800 Series(1996)	74%	£1,676	£375	Grp 25-38	£2,606-£200
Land Rover Discovery(1996)	78%	£1,676	£375	Grp 25-38	£2,606-£200
Talbot Express(1993)	66%	£1,676	£375	Grp 25-38	£2,806same

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 1994 Mercedes 310

Is the 1994 Mercedes 310 reliable?

Below average reliability. Budget extra for maintenance and repairs. 54% of MOT tests on 1994 Mercedes 310s ended in a pass, from 57 tests (DVSA MOT data for tests in 2024, retests included). That's 28 points below the average of 82% across all models in the same data.

How much does a 1994 Mercedes 310 cost to run?

Our estimate is £2,806 a year (£234 a month): £1,676 fuel, £375 road tax, £55 MOT and £700 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 1994 Mercedes 310?

54% of 57 MOT tests on the 1994 Mercedes 310 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 200th of 204 models first registered in 1994 (bottom 3%).

What is the average mileage for a 1994 Mercedes 310?

The average mileage recorded at MOT tests on the 1994 Mercedes 310 is 115,979 miles, which is below the expected 222,000 miles for a 30-year-old car. This suggests lighter use than average, which generally means less wear on major components.