The only place I've seen cetane ratings on the pump is in Maryland. It was right outside Baltimore. Showed it was 40. With this new ULSD in Texas at least, the fuel is supposed to have a minimum cetane rating of 48. Don't know if they'll actually post that on the pump though.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.