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Old 07-07-2008, 12:29 PM
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Default Mercedes GL reliability better info

Because existing sources of auto reliability information left much to be desired, in late 2005 I started conducting my own reliability research at TrueDelta.com. TrueDelta reports absolute stats like "trips to the shop" that make the differences between cars much clearer. Results are updated four times a year, so any significant changes in a model's reliability become apparent quickly.

We've been providing results for both the 2007 and the 2008, but with asterisks for marginal sample size. A few additional participants would really help.

Participants simply report repairs the month after they occur on a one-page survey. When there are no repairs, they simply report an approximate odometer reading four times a year, at the end of each quarter.

To encourage participation, panel members receive full access to the results for free.

For the details, and to sign up to help:

Vehicle reliability research
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Old 12-03-2008, 01:29 PM
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Default RE: Mercedes GL reliability better info

It's been three months, so the results for the Mercedes-Benz GL-Class have been updated again.

Repair rates, in terms of successful repair trips per 100 vehicles per year:

2007: 125, worse than average

2008: 99, worse than average

Sample sizes were small for both years, so these results can only serve as rough indicators of the actual repair rates. With additional participants, we could provide more precise results in future updates.

For the full set of results, and to sign up to help:

TrueDelta Vehicle Reliability Survey results
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  #3  
Old 02-13-2009, 01:01 PM
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We have updated results for the GL-Class. In terms of successful repair trips per 100 cars per year:

2008: 150, worse than average

2007: 134, worse than average

In both cases the sample size is marginal, so on the site these results are asterisked and visible only to members. Their similarity does suggest that these results are accurate. Oddly, we have far more people signed up for the 2007, but more owners responded for the 2008. I'm baffled by the low response rate for the 2007.

A big thanks to everyone who has been helping. We'll have further updates in May, August, and November. With more participants, we could provide more precise information and cover all model years, including the 2009.

We now have a separate results page for each model that includes the results for competitors. The page for the GL-Class:

Mercedes-Benz GL-Class reliability comparisons
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Old 05-04-2009, 11:13 AM
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Another update soon for the 2007 and 2008. More participants remain needed for all model years.

GLK owners also welcome to join--we'd love to be able to provide reliability information on the new compact SUV.

For the details, and to sign up to help:

Vehicle reliability research
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  #5  
Old 06-07-2009, 12:16 PM
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We have updated results for the GL-Class to include owner experiences through March 2009. In terms of successful repair trips per 100 cars per year:

2008: 166, worse than average, decent sample size

2007: 110, worse than average, small sample size

We don't have enough participants to report separately by powertrain. If we did, it is likely that the diesel would have a higher repair rate, thanks to an intercooler hose that tends to detach. This is one reason for the higher reported repair frequency for the 2008.

Another common problem, for all GLs: the exterior door handles tend to break.

A big thanks to everyone who has been helping. We'll have further updates in August and November. With more participants, we could provide more precise information and cover all model years.

We'd also like to cover the new GLK. Just a matter of finding enough owners who can participate.

Mercedes-Benz GL-Class reliability comparisons
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Old 09-06-2009, 01:38 PM
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We have updated results for the GL-Class to include owner experiences through June 2009. In terms of successful repair trips per 100 cars per year:

2008: 145, worse than average, decent sample size

2007: 111, worse than average, small sample size

We don't have enough participants to report separately by powertrain. If we did, it is likely that the diesel would have a higher repair rate, thanks to an intercooler hose that tends to detach. This is one reason for the higher reported repair frequency for the 2008.

Another common problem, for all GLs: the exterior door handles tend to break, and the air suspension also appears to be a trouble spot.

Thanks, again, to everyone who has been helping. We'll have further updates in November and February. With more participants, we could provide more precise information and cover all model years.

Mercedes-Benz GL-Class reliability comparisons
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  #7  
Old 11-15-2009, 12:25 PM
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Updated results later this month.

We're going to start providing new stats for the odds of requiring no repairs and the odds of getting a lemon. These require larger sample sizes, so additional participants would be helpful.

For the details, and to sign up:

Car reliability research
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  #8  
Old 12-23-2009, 11:17 AM
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We have updated results for the GL-Class to include owner experiences through September 30, 2009. In terms of repair trips per 100 cars per year:

2008: 164, worse than average, decent sample size

2007: 81, has improved to about average, small sample size

We still don't have enough participants to report separately by powertrain. If we did, it is likely that the diesel would have a higher repair rate, thanks to an intercooler hose that tends to detach. This is one reason for the higher reported repair frequency for the 2008.

Another common problem, for all GLs: the exterior door handles tend to break, and the air suspension also appears to be a trouble spot.

We'll have further updates in February and May. With more participants, we could provide more precise information and cover all model years.

Mercedes-Benz GL-Class reliability comparisons
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  #9  
Old 01-28-2010, 12:28 PM
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112 GL-Class owners now signed up. A good start, but more are needed to provide precise results for all model years. Especially need more 2009s and 2010s.

Car reliability research
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  #10  
Old 03-03-2010, 11:10 AM
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We have updated results for the GL-Class to include owner experiences through December 31, 2009. In terms of repair trips per 100 cars per year:

2008: 149, decent sample size

2007: 99, small sample size

Both are worse than average.

We still don't have enough participants to report separately by powertrain. If we did, it is likely that the diesel would have a higher repair rate, thanks to an intercooler hose that tends to detach. This is one reason for the higher reported repair frequency for the 2008.

Another common problem, for all GLs: the exterior door handles tend to break, and the air suspension also appears to be a trouble spot.

A big thank you, once again, to everyone who has been helping. We'll have further updates in May and August. With more participants, we could provide more precise information and cover all model years.

Mercedes-Benz GL-Class reliability comparisons
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