Mercedes 320

Reliability, estimated running costs, and MOT data across 12 model years from 1,202 MOT tests in 2024.

Avg Pass Rate

79%

Total Tests

1,202

Highest Pass Rate

1993 (84%)

Years Covered

About the Mercedes 320

The Mercedes 320 was MOT tested 1,202 times in 2024 (DVSA data, retests included) across 12 model years (1992 to 2009), with an average pass rate of 79%. That's close to the average of 82% across all models in our data. Our records list petrol and diesel versions.

Best and Worst Years

Of the years with at least 100 tests, the 1993 model has the highest pass rate at 84% from 376 tests. The 2008 model has the lowest at 75%. The 9 point gap means pass rates vary somewhat between years, but no year is dramatically different. Newer cars usually pass more often simply because they are younger.

Reliability Trend

The Mercedes 320 has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.

Mileage Across Years

The oldest model in our data (1992) averages 138,038 miles, while the newest (2009) averages 117,144 miles. Older models have covered serious mileage, so suspension and drivetrain wear are worth checking.

Compared to the Mercedes brand average of 87%, the 320 is 8 points lower, placing it among the less reliable Mercedes models.

Estimated Running Costs

Fuel (Diesel, 3199cc)

£1,676

Road Tax

£760

MOT Test

£55

Predicted Repairs

Higher due to low pass rate

£500

Total per year£2,991

Per month£249/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 2009 details

How reliable is the Mercedes 320?

vs average of all models-3% (82% avg)

vs Mercedes brand average-8% (87% avg)

Best to worst year spread9 percentage points

Reliability trendStable over years

Mercedes 320 by Year

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

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

Questions about the Mercedes 320

Is the Mercedes 320 reliable?

Across its 12 model years in our data (1992 to 2009), the Mercedes 320 averages a 79% MOT pass rate, from 1,202 tests (DVSA MOT data for tests in 2024, retests included). That's 3 points below the average of 82% across all models in the same data. The 1993 model has the highest pass rate of the years with at least 100 tests, at 84%.

Which year Mercedes 320 has the best MOT pass rate?

Of the years with at least 100 tests, the 1993 Mercedes 320 has the highest MOT pass rate at 84%, while the 2008 model has the lowest at 75%, a 9 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.