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All the major brands that meet API CI-4/SL are just as good as any other. The only practical difference is advertising and promotion. So DELO is just as good as Rotella, and Mobil is just as good as DELO and Motorcraft is just as good as any of them. So don't worry about the brand name - just be sure it meets API CI-4/SL.
The only reason DELO might be getting harder to find is if Chevron hasn't done a good job of promoting it to the truckers in your area. Retailers stock what sells, so if DELO is not selling, they won't stock it much longer. Around here it's still a popular choice and available at Sam's Club, Costco, Wal-Mart, and almost every big truck stop and many of the convenience-store truck stops. But Rotella is even more popular so it's even available at most supermarkets. /ubbthreads/images/graemlins/cool.gif
BTW, do you know where Chevron came up with the name DELO? It's short for <font color="red">D</font>iesel <font color="red">E</font>ngine <font color="red">L</font>ubricating <font color="red">O</font>il. /ubbthreads/images/graemlins/warmsmile.gif
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Gotta disagree with the "popular" theory. My 'Stroke drinks DELO like Kool-Aid, about a gallon between changes. It burns Rotella at a rate of less than an QT per 5K interval. BTW, pretty cool info on the DELO acronym.