With JET's support, for which I am very grateful, I've been posting once a month about the TrueDelta's reliability research.

We promptly update results four times a year, and provide actual repair rates, not just vague dots.

Thanks to people here, we'll have a partial result for the 2005 next week. But we need more participants before all years of the C6 A6 can be fully included in the results.

Participants report repairs the month after they occur. 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 free of charge.

For the details, and to sign up to help out, click the link below.<ul><li><a href="http://www.truedelta.com/reliability.php">Vehicle reliability research - need more Audis</a></li></ul>

345 Audi A6 owners now signed up. A very good start, but more remain needed to cover all model years.

Car reliability research (http://www.truedelta.com/reliability.php)

We've updated the results for the A6 to include owner experiences through March 2009. In terms of successful repair trips per 100 cars per year:

2006: 54, about average, small sample size

A big thank you to JET, this forum, and 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.

Audi A6 reliability comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9&email=Guest)

According to two independent sources the best which have got low braking issues are A6/S6, these are measured : on each 1000 cars how much getting back to service with major problems :


Place Make Model(e) 2000 2001 2002 2003 2004 2005

1 Audi A6 / S6 42.3 27.8 18.3 10.4 5.8 4.9

2 Mercedes Klasa S 43.5 40.6 24.5 8.7 4.8

3 Mercedes Klasa E 55.5 44.5 26.6 10.6 5.7 6.8

4 BMW Seria 5 51.6 41.3 32.2 16.1 7.1 6.1

5 VolvoV70/S80/S70/S60 58.8 46.6 33.3 18.0 12.2 12.2

Audi seems to be the best

Interesting numbers. What's the source? Clearly European.

My data suggest that the C6 is likely to be more reliable than the C5.

We continue to need more participants for the C6. 395 A6 owners signed up so far, but most of these are for the C5.

To help get your year included:

Car reliability research (http://www.truedelta.com/reliability.php)

We've updated the results for the C6 A6 to include owner experiences through June 2009. In terms of successful repair trips per 100 cars per year:

2006: 71, about average

2005: one response short of the bare minimum

A big thanks, once again, to JET, this forum, and 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.

Audi A6 reliability comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9&email=Guest)

We continue to have far more participants for the 2006 than any other year. Why? I have no idea.

So we'll again have results only for the 2006 next month. Would like to cover all model years, but this is up to owners.

Help get your year included:

Car reliability research (http://www.truedelta.com/reliability.php)

We continue to have far more participants for the 2006 than any other year. Why? I have no idea.

So we'll again have results only for the 2006 next month. Would like to cover all model years, but this is up to owners.

Help get your year included:

Car reliability research (http://www.truedelta.com/reliability.php)

I 'll join in it.Thanks.

We've updated the results for the A6 to include owner experiences through September 30, 2009. The 2006 A6's reported repair frequency of 75 repair trips per 100 cars per year is about average. We fell just a couple responses short of also having a result for the 2005.

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

Audi A6 reliability comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9&email=Guest)

439 A6 owners now signed up. A good start, but more are needed to provide precise results for all model years.

Not yet signed up? Details here:

Car reliability research (http://www.truedelta.com/reliability.php)

Interesting numbers. What's the source? Clearly European.

My data suggest that the C6 is likely to be more reliable than the C5.

We continue to need more participants for the C6. 395 A6 owners signed up so far, but most of these are for the C5.

To help get your year included:

Car reliability research (http://www.truedelta.com/reliability.php)

JD Power in the UK had the C6 as best exec, and 6th overall for 2009. That's pretty good.

Recently enhanced the related repair history survey so that it can (optionally) be used as a personal car maintenance record.

As always, more participants would be helpful. Updated Car Reliability Survey results in May.

Car reliability research (http://www.truedelta.com/reliability.php)

We've updated the results for the A6 to include owner experiences through March 31, 2010. In terms of repair trips per 100 cars per year:

2006: 83, about average

2005: 137, worse than average, small sample size

Thank you, once again, 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.

Audi A6 reliability comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9&email=Guest)

We've updated the results for the A6 to include owner experiences through June 30, 2010. Other sources of car reliability information won't cover the more recent months until the summer or even fall of next year.

Repair frequencies, in terms of repair trips per 100 cars per year:

2006: 67, about average

2005: 113, worse than average, small sample size

Thank you, once 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.

To see how competitors compare, and to sign up to help improve this information:

Audi A6 reliability comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9)

Consumer Reports recently rated the C6 A6 as one of the two most unreliable cars in its survey (the other being the Jaguar XF). But their results are sometimes off by a surprisingly large margin.

I'd like to have some results for recent model years of the C6 A6--a matter of getting more owners involved.

Help make this happen:

Car reliability research (http://www.truedelta.com/reliability.php)

We've updated the results for the A6 to include owner experiences through September 30, 2010. Other sources of car reliability information won't cover the months since April until the summer or even fall of next year.

Repair frequencies, in terms of repair trips per 100 cars per year:

2007: 189, worse than average but very small sample size; the result for the 2006 is likely much more accurate

2006: 69, about average

2005: 112, about average

Decent sample size for the 2006, small and even very small sample sizes for the others.

Thank you, once again, to JET, this forum, and everyone who has been helping. We'll have further updates in February and May. With more participants, we could provide more precise information and cover all model years.

To see how competitors compare, and to sign up to help:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9)

Mike, I think CR's unreliable rating was based on the new 3.0T cars. They used to like the 3.2. CR is annoying that way variant to variant, they will recommend the GS for example and not really point out less than stellar record of the AWD model.

Mike, I think CR's unreliable rating was based on the new 3.0T cars. They used to like the 3.2. CR is annoying that way variant to variant, they will recommend the GS for example and not really point out less than stellar record of the AWD model.

I recall the same, but not necessarily because of the engine. CR will often single out an engine, but then you'll look at the detailed ratings and the problem is something unrelated like the audio system.

We have quite a few 2010 S4 owners participating in the survey, and they haven't been reporting problems with the supercharged 3.0.

We've updated the results for the A6 to include owner experiences through December 31, 2010. Other sources of car reliability information won't cover the months since April until the summer or even fall of this year.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 127, worse than average

2007: 163, worse than average

2006: 38, better than average

2005: 127, worse than average

The 2006 is the only year with a decent sample size, though the 2005 is close. The sample sizes for the 2007 and 2008 are very small, so these results are mosts likely to be inaccurate.

I am not sure how to reconcile the difference between the 2006 and the others, other than to suggest that this difference would go away with larger sample sizes, especially for the 2007 and up.

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.

To see how competitors compare, and to sign up to help:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9)

606 owners signed up for the A6. A very good start, but more remain needed for all model years.

To help:

Car reliability research (http://www.truedelta.com/reliability.php)

FWIW, JD Power has the 2007 A6 as an award winner as most dependable, along with a 5 start long term dependability rating.

Weird that your 2007 numbers don't match.

http://www.jdpower.com/autos/Audi/A6/2007/Sedan/

FWIW, JD Power has the 2007 A6 as an award winner as most dependable, along with a 5 start long term dependability rating.

Weird that your 2007 numbers don't match.

http://www.jdpower.com/autos/Audi/A6/2007/Sedan/

As stated, the sample sizes for the 2007 and 2008 are very small. We have a much lower reported repair frequency for the 2006, where the sample size is larger.

But also realize that different surveys ask different questions. Ask different questions, and you'll often get different results. It's very important to know the questions behind any survey-based stats.

But can you find out which questions JD Power asked?

As stated, the sample sizes for the 2007 and 2008 are very small. We have a much lower reported repair frequency for the 2006, where the sample size is larger.

But also realize that different surveys ask different questions. Ask different questions, and you'll often get different results. It's very important to know the questions behind any survey-based stats.

But can you find out which questions JD Power asked?

I understand your point, and JD is pretty much bull**** anyway, I'm just surprised that the discrepancy/difference in results is so huge.

BTW: I'm now participating on your site.

Thanks for participating--this will help fix any discrepancy.

Usually when our results are off it's because the sample size is still too small. J.D. Power's results are sometimes off as well, though for different reasons. It's possible that this time both are off, but in different directions.

We've updated our car reliability stats for the C6 Audi A6 to include owner experiences through March 31, 2011.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 100, worse than average

2007: 97, about average

2006: 38, better than average

2005: 161, worse than average

Decent sample sizes for the 2005 and 2006, though the 2006 result appears off.

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

To see how competitors compare, and to sign up to help improve this information:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9)

We've updated the our reliability stats for the C6 A6 (on our redesigned site!) to include owner experiences through September 30, 2011.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 91, worse than average, small sample size

2007: 41, better than average, small sample size

2006: 69, about average

2005: 182, worse than average

Decent sample sizes for the 2005 and 2006, small and even very small sample sizes for the others. This could explain some inconsistencies. It might also help to break out our reliability stats by engine, but not yet enough cars in the sample.

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

To see how competitors compare, and to sign up to help improve this information:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/car-reliability.php?stage=pt&bd=Audi&mc=9)

We've updated the our reliability stats for the C6 A6 (on our redesigned site!) to include owner experiences through December 31, 2011.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 92, about average

2007: 57, about average

2006: 79, about average

2005: 161, worse than average

Decent sample sizes for the 2005 and 2006, small and even very small sample sizes for the others. This could explain some inconsistencies. It might also help to break out our reliability stats by engine, but not yet enough cars in the sample.

We'll have further updates later this month and in August. With more participants, we could provide more precise information and cover all model years.

To see how competitors compare, and to sign up to help improve this information:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/Audi-A6/reliability-9)

I am sure the newer model years will catch up quickly...what a difference a year can make.

We've updated the our reliability stats for the A6 to include owner experiences through September 30, 2012.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 70, about average, small sample size

2007: 88, worse than average, sample size one car short of the minimum

2006: 35, better than average, unclear why this stat is much better than those for the 2007 and 2008

2005: 118, worse than average

We'll have further updates in February and May. We'd love to provide more precise stats and cover more model years--just a matter of getting more owners involved.

To see how competitors compare, and to sign up to help improve this information:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/Audi-A6/reliability-9)

We've updated the our reliability stats for the A6 to include owner experiences through December 31, 2012.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008: 41, low, small sample size

2007: 74, moderate, small sample size

2006: 47, low, unclear why this stat is much better than that for the 2007

2005: 83, moderate

Thank you, once again, to everyone who has been helping. We'll have further updates in May and August. The more owners participate, the more comprehensive and precise these will be.

To see how competitors compare, and to sign up to help:

Audi A6 reliability ratings and comparisons (http://www.truedelta.com/Audi-A6/reliability-9)