There probably aren’t many people who remember the last time Cadillac included a diesel engine as an optional powerplant for its coupe and sedans. Yes, there really was a brief period—1978 to 1982—when a factory-installed oil burner (Oldsmobile’s 5.7L LF9 V-8) could be had in Caddy-badged luxobarges such as Eldorado, Seville, de Ville, and Fleetwood
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