Well, it also says M1 0W-40 for a W123 240D (sure sounds like a shotgun approach for their oil selection system)


Personally, I'd side with a 5W-40 diesel rated synthetic, or a 15W-40 diesel rated conventional. Maybe slightly thicker in warmer climates...

Last I saw, the turbodiesel truck M1 was 5W-40

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting