Agreed. I could never keep Rotella in my engines, was always adding oil as it vaporized off.
I use Mobil Delvac black jug conventional and do 10K oil changes, which is about every month during the season. I have about 800K happy miles on seven Duramax trucks using this method and brand. I carry no oil on the trucks, never add between oil changes anymore.
Interestingly, CAT has stepped away from use of multi-viscosity oils (Rotella 15/40 is just as commonly used in the marine industry) in their turbocharged and aftercooled marine engines for the same reason - breakdown.
As the oil breaks down, it plugs the aftercoolers with sticky black goo that is residual from the additive package that gives the oil its multi-viscosity properties. CAT now requires a straight weight DELO 30W for my boats twin CATs.
I had maintenance records from the previous owner that indicated Rotella had been used about half the seasons since 2000, so I had the aftercoolers pulled and steam cleaned, engine oil changed to DELO 30W.
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