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Thread: BMW 5-Series reliability

  1. #26
    Join Date
    Nov 2005
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    Michigan
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    2003 Protege5
    Quote Originally Posted by Dexm View Post
    One also wonders if the sort of people to particpate in polls are the sort who either take care of their cars or not; or if they're more likely or less likely to have had good experiences with their cars. Do they run the extremes, and thus are they more likely to want to have their say?
    These days most are having good experiences with their cars. In any given month only about 1/10 of participants report any sort of repair.

    The survey process is designed to weed out those who simply want to vent, since you cannot sign up and immediately respond to the main survey.
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  2. #27
    Join Date
    Jun 2006
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    Burtonsville, MD
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    9,612
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    e39 540i/6, e36 318i
    I've had my 1996 3-Series enrolled for a while and just added my 1997 5-series.
    1985 325 - 5 speed - LSD - M50NV - MS2/extra - AEM UEGO - TiAL MV-R - 750cc injectors - HX35 - Blunttech Manifold - 3" exhaust
    1991 318i - 5 speed - M50NV - e36 rack - Smileys

  3. #28
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    Nov 2005
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    Michigan
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    2003 Protege5
    Thanks, I appreciate it.

    We've updated the results for the 5-Series to include owner experiences through March 2009. In terms of successful repair trips per 100 cars per year:

    2008: 48, about average

    2007: 71, about average

    2006: 96, about average

    2004: 126, worse than average

    Sample sizes small for all but the 2008.

    A big thank you 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.

    BMW 5-Series reliability comparisons
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  4. #29
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    Nov 2005
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    Michigan
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    2003 Protege5
    382 5-Series owners now signed up. A great start, but more remain needed to properly cover all model years from 1995 on.

    Updated results in August. We hope to cover more model years this time around, but in many cases it's going to be tight.

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  5. #30
    Join Date
    Jul 2009
    Location
    DC
    Posts
    17
    My Cars
    2002 530i
    I'll go sign up now

  6. #31
    Join Date
    Nov 2005
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    Michigan
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    2003 Protege5
    Thanks, I appreciate it.

    We'll have results for the 2003, 2004, 2006, 2007, and 2008 next month. Full results for the 2008, partial results for the others. Falling a couple responses short with the 2002.

    We'd like to have full results for all model years, it's just a matter of how many owners participate. To help us do this sooner rather than later:

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  7. #32
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    2003 Protege5
    Updated results will be posted to the site tomorrow. 408 5-Series owners now signed up. A very good start, but more are needed to provide precise results for all model years from 1995 on.

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  8. #33
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    Nov 2005
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    Michigan
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    2003 Protege5
    We've updated the results for the 5-Series to include owner experiences through June 2009. In terms of successful repair trips per 100 cars per year:

    2008: 59

    2007: 48

    2006: 125

    2004: 152

    2003: 192

    2002: 256

    The 2007 and 2008 are about average, the others worse than average. Sample sizes small for all but the 2008.

    A big thank you 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.

    BMW 5-Series reliability comparisons
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  9. #34
    Join Date
    Oct 2009
    Location
    Chicago
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    E39 2001 525i a
    just signed up to help out 01' 525i

  10. #35
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    Nov 2005
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    Michigan
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    2003 Protege5
    Updated results again 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:

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  11. #36
    Join Date
    Nov 2009
    Location
    California
    Posts
    1
    My Cars
    Volkswagen Polo
    As far as i know BMW cars especially 5 series are very reliable. I love the way the car looks and feels while driving.....
    ________________________________
    Dining Room Furniture

  12. #37
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    Michigan
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    2003 Protege5
    We've updated the results for the 5-Series to include owner experiences through September 30, 2009. In terms of repair trips per 100 cars per year:

    2008: 59

    2007: 83

    2006: 111

    2004: 111

    2003: 193

    2002: 251

    The 2007 and 2008 are about average, the 2004 is on the edge between "average" and "worse than average," an the others are worse than average. Sample sizes small for all but the 2007 and 2008.

    We've also introduced two new statistics, "Nada-odds" and "Lemon-odds," to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop.

    In the case of the 2008 5-Series, the percentage with no repairs is about 56, while the percentage of lemons is about 4. Not enough responses to provide these stats yet for other years.

    Nada-odds and Lemon-odds car reliability stats

    A big thank you, once again, to 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.

    BMW 5-Series reliability comparisons
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  13. #38
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    Dec 2009
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    us
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    honda
    Engine problems are very rare in first few months with any car but problem I have seen is with driving habits only.

    BMW Headlights
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    Last edited by fiama; 12-23-2009 at 08:45 PM.

  14. #39
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    Dec 2009
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    Las Vegas,Nevada
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    7
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    99 BMW 528i
    I just signed up... More Power!!!!

  15. #40
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    Aug 2009
    Location
    Houston TX
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    My Cars
    2004 M3
    Good service INS 1, INS 2 = reliability.

  16. #41
    Join Date
    Nov 2005
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    Michigan
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    2003 Protege5
    We've updated the results for the 5-Series to include owner experiences through December 31, 2009. In terms of repair trips per 100 cars per year:

    2009: 16, very small sample size

    2008: 59

    2007: 75

    2006: 149

    2005: 59, very small sample size

    2004: 123

    2003: 179

    2002: 167

    2001: 245

    The 2009 is better than average (so far), the 2005, 2007, and 2008 are about average, and the others are worse than average. Sample sizes small for all but the 2007 and 2008.

    We have two additional statistics, "Nada-odds" and "Lemon-odds," to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop.

    In the case of the 2008 5-Series, the percentage with no repairs is about 65, while the percentage of lemons is about 3. Not enough responses to provide these stats yet for other years.

    Nada-odds and Lemon-odds car reliability stats

    A big thank you, once again, to this forum and 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.

    BMW 5-Series reliability comparisons
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  17. #42
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    Mar 2009
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    Mtns
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    M20 - M30 - N62/S
    mind you, minimum sample size has to be 101 for any statistical study to be close to valid.. 100 is even small. n=100+1

  18. #43
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    Nov 2005
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    Michigan
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    2003 Protege5
    Simply not true. The minimum sample size depends on the amount of variance, and how precisely you want to measure it. There's no fixed number for all cases.

    I've intentionally selected a metric that minimizes variance, and the results don't have to be highly precise to provide useful information.
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  19. #44
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    Nov 2005
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    Just 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, with a preview for participants next month.

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  20. #45
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    548 5-Series owners now signed up. A great start, but more remain needed to cover all years from 1995 on. Once we get enough participants we'll split out results by engine.

    Not yet signed up? Details here:

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  21. #46
    Join Date
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    We've updated the results for the 5-Series to include owner experiences through March 31, 2010. In terms of repair trips per 100 cars per year:

    2009: 37, better than average

    2008 528/550/M5: 54, about average

    2008 535: 78, about average, but not far from "worse than average"

    2007: 107, worse than average

    2006: 135, worse than average

    2005: 55, better than average, but very small sample size and results for other years suggest that this one is not accurate

    2004: 119, worse than average

    2003: 158, worse than average

    2002: 132, about average

    2001: 286, small sample size; actual repair frequency probably lower but still worse than average

    2000: 115, about average, but small sample size and results for other years suggest that this one is not accurate

    1999: 185, worse than average

    Sample sizes small for all but the 2007 and non-535 2008. This likely explains some inconsistencies from model year to model year. With more participants, we could provide more precise information and cover all model years.

    A big thank you, once again, to this forum and everyone who has been helping. We'll have further updates in August and November.

    BMW 5-Series reliability comparisons
    www.truedelta.com
    Price comparisons, quick and thorough
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  22. #47
    Join Date
    Nov 2005
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    Michigan
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    2003 Protege5
    This week we'll start previewing the next set of results to participants. The preview results will be updated as responses come in.

    My focus: how many model years will we be able to fully cover this time around? This depends on the number of owners that participate.

    To help provide the best possible information on your year:

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  23. #48
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    Nov 2005
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    2003 Protege5
    We've updated the results for the 5-Series 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:

    2009: 43, about average, more participants needed to split by engine

    2008 528/550/M5: 53, about average

    2008 535: 64, about average

    2007: 114, worse than average

    2006: 116, worse than average

    2005: 52, better than average, but very small sample size and results for other years suggest that this one is not accurate

    2004: 148, worse than average

    2003: 128, worse than average

    2002: 82, about average, but very small sample size and results for other years suggest that this one is not accurate

    2001: 257, small sample size; actual repair frequency probably lower but still worse than average

    2000: 125, about average

    1999: 126, about average

    Sample sizes small for all but the 2007 and non-535 2008. This likely explains some inconsistencies from model year to model year. With more participants, we could provide more precise information and cover all model years.

    Thank you, once again, to this forum and everyone who has been helping. We'll have further updates in November and February.

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

    BMW 5-Series reliability comparisons
    www.truedelta.com
    Price comparisons, quick and thorough
    More useful reliability information

  24. #49
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    Nov 2005
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    2003 Protege5
    Starting this month we have a new question to measure, as objectively as possible, the severity of a problem. Many people have been asking for reliability stats that weight problems by how severe they are, and once we have enough responses with the revised survey we'll start providing this.

    Also, updated reliability stats this month.

    As always, the more owners participate, the better the information we can provide to everyone.

    Car reliability research
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  25. #50
    Join Date
    Aug 2010
    Location
    Melbourne, Vic, Australia
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    2001 BMW E39 M-Sport
    Not sure if I have missed it but your average odometer reading has no unit, is it miles or km? I assume it's miles but not stated in table.

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