Get an old 1977-85 240d or 300d. It will be slow (like, seriously slow), but will run basically forever with maintenance that is mostly very DIY friendly, and i

Get an old 1977-85 240d or 300d. It will be slow (like, seriously slow), but will run basically forever with maintenance that is mostly very DIY friendly, and it will be surprisingly frugal, partly because of the diesel engine and partly because it will kill any ambition to speed. The OM616 and OM617 are some of the most reliable car engines ever produced.