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The "on board diagnostics" have nothing to do with measuring oil quality. It's not like there is a small laboratory inthe oil pan with a robot that does spectrochemical analysis and chemical titration! Any car in which the computer calculates oil life does it with algorithms that gather info including miles driven, perhaps the amount of time spent idling, and the duration of each trip. The algorithm probably starts with a figure, say 7,000 miles, and then decrements it every time there is a short trip or any extended idling. It certainly couldn't tell the difference between Rotella and Delvac. Hell, you could fill your crankcase with corn syrup instead of oil and the "on board diagnostics" would continue to calculate your oil life while your engine destroyed itself.
I just changed my oil thought I'd try something different I put 2 an 1/2 qts. of syn and the rest dino along w/12 oz. of torco EAL (engine assembly lube)
I know at work.... we use the Rotellla ... and usally... we run atleast 10,000 miles between changes... some of us are hard on the trucks... sum are'nt... But for the most part.... the trucks run fine.... just regular wear and tear....