Best 15 W 40 Diesel Oil

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Indeed there are many quality options, but it is interesting what oil most of the heavy duty engine OEMs pick for R&D work (not the beancounter-driven "factory fill" oil for the truck assembly line):

CAT: Mobil Delvac technology
Detroit Diesel: Mobil Delvac technology
Mercedes Benz: Mobil Delvac technology
Volvo: Mobil Delvac technology
Mack: Mobil Delvac technology

In truck stops, Mobil Delvac 1300 is the #1 oil as well (overtaking Rotella - now #2 - a couple years ago).
 
I think these days it is splitting hairs to find the "best" one. Although, it does happen that many users find one that works better for their particular needs than another.
 
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