Oil
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From: Southern Oregon USA
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I use any Diesel rated oil, they are all good. Usually I just hit up the Freightliner or Peterbuilt dealers as they have pretty much all of the good ones between the 2 places. Cost me $43 for 5L of Valvoline Max Blue(I think thats what it is called) its full synthetic and supposed to be factory fill for Cummins.
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Delo 400 is old technology? The HDEO with the most advanced additive package is old technology? The first CJ-4 rated HDEO is old techolgy? Are you kidding, Chevron/Oronite has been consistently ahead of the curve on HDEOs for a very long time now.