My boss is debating whether to buy a new Porsche Boxster or a new BMW
Z4 and he would like to know how the two BRANDS (not models) generally
fare after 100,000+ miles of primarily highway driving. He is under
the impression that BMW's, if treated well, can be expected to "live"
for at least 100,000 highway miles. He does not know if he should
expect the same from Porsche.

An answer to my question could come in the form of one or several
sources (preferably objective and credible, e.g. "Car & Driver")
stating that, "after 100,000 + highway miles, BMWs will generally be
found in good working order, while Porsches will be ready for the
scrapyard."

To give you additional background, my boss currently drives a 1991 BMW
3-series with 150,000 mostly highway miles on it. With the help of the
occasional relatively inexpensive visit ($500 - $1,000) to the
mechanic's garage, it is still running strong. This personal
experience is part of the reason he trusts BMW. He wants to know if he
is likely to have a similar experience with Porsche.

Thanks!

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Request for Question Clarification by jbf777-ga on 18 Feb 2003 12:13 PST

I'm waiting to hear back from a potential source for this information. 
 
Thanks,
 
jbf777-ga
GA Researcher

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Request for Question Clarification by jbf777-ga on 25 Feb 2003 14:07 PST

Sorry... doesn't look like there's any real official source for such
info that I can locate.

I couldn't find an authorative article, but this could help. Dozens of
owners have detailed their cars history and their satisfaction with it
at CarSurvey.org

By reading each report, you can get an idea of which make has the best
longevity.


Porsche
http://www.carsurvey.org/manufacturer_Porsche.html

BMW
http://www.carsurvey.org/manufacturer_BMW.html

I have run two Porsche for over 100 000 miles, covered over a period
of about 5 years in each case, and found both cars to be more than
capable of these mileages.  The main criteria for longevity are oil
changes with quality lubricants and planned maintenance rather than
the reactive approach.  Neither car developed any significant faults
and the interiors looked as new when each vehicle was sold.  Also, I
was sorry to see each one go, as was my eldest daughter! Mike