These diesel luxo tanks (W126 300SD and W123 300D) may appear unremarkable at first blush but subtle charm is actually their most endearing quality. The perfect balance of utilitarianism and refinement, these range toppers feel solid, secure and planted to the road. Power and agility, not so much. But so what – I’d drive my (future) family across the states in one and feel equally as comfortable pulling up to the valet at Avalon Beverly Hills as I would cruising down a bumpy dirt road with a full load at speed. Sure, a Civic could smoke you, but as he blows by, take a gander at the indestructible MB-Tex upholstery, beautifully designed center console, and 500k odometer reading. You’ll soon realize you’ve already won.