Mercedes 312

Reliability, estimated running costs, and MOT data across 4 model years from 305 MOT tests in 2024.

Avg Pass Rate

75%

Total Tests

305

Model Years

1996 to 1999

Years Covered

About the Mercedes 312

The Mercedes 312 was MOT tested 305 times in 2024 (DVSA data, retests included) across 4 model years (1996 to 1999), with an average pass rate of 75%. That's 7 points below the average of 82% across all models in our data, so check the year-by-year data carefully before buying. Our records list diesel versions.

Mileage Across Years

The oldest model in our data (1996) averages 120,870 miles, while the newest (1999) averages 150,478 miles. Older models have covered serious mileage, so suspension and drivetrain wear are worth checking.

Compared to the Mercedes brand average of 87%, the 312 is 12 points lower, placing it among the less reliable Mercedes models.

Estimated Running Costs

Fuel (Diesel, 2874cc)

£1,676

Road Tax

£375

MOT Test

£55

Predicted Repairs

£350

Total per year£2,456

Per month£205/mo

Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.

Full 1999 details

How reliable is the Mercedes 312?

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

vs Mercedes brand average-12% (87% avg)

Mercedes 312 by Year

Click any year to see detailed running costs, reliability data, and comparisons with similar cars.

Year	Pass Rate	Tests	Avg Mileage
1999	81%	43	150,478 mi
1998	72%	82	130,350 mi
1997	63%	89	148,765 mi
1996	84%	91	120,870 mi

Questions about the Mercedes 312

Is the Mercedes 312 reliable?

Across its 4 model years in our data (1996 to 1999), the Mercedes 312 averages a 75% MOT pass rate, from 305 tests (DVSA MOT data for tests in 2024, retests included). That's 7 points below the average of 82% across all models in the same data.