BMWs are no doubt excellent cars but,require much more specialized maintenence which has to be taken to an experienced BWM mechanic. Your need special tools to work on a BWM and the tools are EXPENSIVE. I found Mercedes Benz cars need very few special tools to do major work and regular maintenance. If you can afford to have it worked on by someone else all the time there is not a lot of differnce. You need a "BMW" and nothing else mechanic to get satisfactory performence and repairs dont right.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T