Mobil-1 5w40 Turbo Diesel vs Delvac?

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What is the difference if they are made by same company? Is one intended for F-350's and one for Peterbuilt's or what?
 
They are not exactly the same. They are reasonably close enough for our day-to-day comparisons, performance wise.

The real significant differences are in the marketing. Delvac 1 is seen at OTR truck stops and service joints. TDT is seen at your local auto-parts and WallyWorld places.

They are different, but your vehicle (whatever it might be) is likely not going to be able to distinguish the difference.
 
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