I have always used Rotella T in all my Diesels (various Ford PSDs, Dodge with Cummins, Dads 350SDL, etc) and thats what rag doll currently uses.
Supertech is probably a decent oil if you change frequently.
The local MB dealer uses M-1 in everything.
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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500
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