Some europaphobia here that reminds of the Airbus-antipathy-thread.
The ADAC (Allgemeiner deutscher Automobil-Club) is the world's largest (by numbers of members, and lobbying power) cardriver association, thus their statistics on malfunctions in cars have some weight (car producers fear them like the devil). Included are cars that were running from 2001-2006. Numbers are failures per 1000.
http://www.autosieger.de/images/arti...k_2006_15g.jpg
after several years when Japanese cars prooved to be the most reliable, in the recent past German cars in general, not only Mercedes, are claiming top positions again.
Part of that yearly statistic is also the reasons for malfunctions. Here, with close to 40%, electrical system is the top candidate.
http://www.heise.de/autos/bildergalerien/3788/1