The build quality seems to be improved on the newer Audis and they are attracive cars ( they copied a lot from the Mercedes Benz styling). You must look at the maintenance requirements and tools that need to be purchased. For example look at BMWs, you have got to invest a lost of cash in tools to do just basic maint. Not true for Mercedes-Benz.

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