My personal observation is that the interiors fall apart...look at the back seat on a 320i, especially cloth, it literally falls apart. I think I want an early 70's Bavaria (E3 body) or mid-70's 530/528 (E12 body) sedan. The problem is, the last Bavaria I saw locally was rusting into the ground in a yard near by kids' grade school, and I can't think of the last time I have even seen an E12 car, while there are W114/115's and W123's all over the place, in conditions from pristine to falling apart. Perhaps that is a clue...

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2002 Ford ZX2
2 x 2013 Honda Civics