Mercedes GL 320
Reliability, estimated running costs, and MOT data across 4 model years from 865 MOT tests in 2024.
Avg Pass Rate
80%
Total Tests
865
Highest Pass Rate
2007 (79%)
Years Covered
4
About the Mercedes GL 320
The Mercedes GL 320 was MOT tested 865 times in 2024 (DVSA data, retests included) across 4 model years (2006 to 2009), with an average pass rate of 80%. That's close to the average of 82% across all models in our data. Our records list diesel versions.
Best and Worst Years
Of the years with at least 100 tests, the 2007 model has the highest pass rate at 79% from 501 tests. The 2009 model has the lowest at 75%. With just a 4 point gap, pass rates are similar across these years. Newer cars usually pass more often simply because they are younger.
Reliability Trend
The Mercedes GL 320 has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
Mileage Across Years
The oldest model in our data (2006) averages 129,501 miles, while the newest (2009) averages 125,291 miles. Older models have covered serious mileage, so suspension and drivetrain wear are worth checking.
Compared to the Mercedes brand average of 87%, the GL 320 is 7 points lower, placing it among the less reliable Mercedes models.
Estimated Running Costs
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 detailsHow reliable is the Mercedes GL 320?
Mercedes GL 320 by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the Mercedes GL 320
Is the Mercedes GL 320 reliable?
Across its 4 model years in our data (2006 to 2009), the Mercedes GL 320 averages an 80% MOT pass rate, from 865 tests (DVSA MOT data for tests in 2024, retests included). That's 2 points below the average of 82% across all models in the same data. The 2007 model has the highest pass rate of the years with at least 100 tests, at 79%.
Which year Mercedes GL 320 has the best MOT pass rate?
Of the years with at least 100 tests, the 2007 Mercedes GL 320 has the highest MOT pass rate at 79%, while the 2009 model has the lowest at 75%, a 4 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
Are newer Mercedes GL 320s more reliable?
The Mercedes GL 320 has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
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