Mercedes Gl 320
Reliability, running costs, and MOT data across 4 years from 865 real MOT tests.
Avg Pass Rate
80%
Total Tests
865
Best Year
2006 (90%)
Years Covered
4
How reliable is the Mercedes Gl 320?
Mercedes Gl 320 by Year
Checking a specific Mercedes Gl 320?
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About the Mercedes Gl 320
The Mercedes Gl 320 has been tested 865 times in 2024 MOT data across 4 model years (2006 to 2009), with an average pass rate of 80%. That's close to the national average of 82%. Available as diesel.
Best and Worst Years
The 2006 model is the most reliable with a 90% pass rate from 77 tests. The 2009 model has the lowest at 75%. The 15 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
Older MERCEDES GL 320s tend to have better MOT pass rates than newer ones, with an average decline of 9 percentage points across model years.
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.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.