Mercedes 320
Reliability, running costs, and MOT data across 12 years from 1,202 real MOT tests.
Avg Pass Rate
79%
Total Tests
1,202
Best Year
1994 (91%)
Years Covered
12
About the Mercedes 320
The Mercedes 320 has been tested 1,202 times in 2026 MOT data across 12 model years (1992 to 2009), with an average pass rate of 79%. That's close to the national average of 82%. Available as petrol and diesel.
Best and Worst Years
The 1994 model is the most reliable with a 91% pass rate from 66 tests. The 2001 model has the lowest at 70%. With a 21 point spread, choosing the right year makes a big difference to reliability.
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.
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
Higher due to low pass rate
Based on 7,400 miles/year, current fuel prices, and MOT pass rate data. Insurance not included.
Full 2009 detailsHow reliable is the Mercedes 320?
Mercedes 320 by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
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