Rob,
Rotella is the last oil I used before tearing it apart. It was recommended to me by Terry Dyson, the owner of an oil analysis company who has been doing this for several decades, so I figured it was based on at least somewhat sound reasoning. Specifically, Terry found that my oil had relatively high concentration of unburned gas (which he told me is common in these engines), and that there's something in Rotella's formaulation that stands up well to fuel dilution.
But I take all things related to oil with a huge grain of salt. It's so difficult to obtain objective data, that opinions tend to be based on reasoning such as "I put Brand X oil into my engine, and two days later, my engine blew up, therefore Brand X is crap" (when in fact the trajedy could very well have had nothing to do with the oil), or, "I've always used Brand Y, and have never had any problems, therefore Brand Y is the greatest stuff ever made" (when he probably "wouldn't have had any problems" had he used any of a multitude of different brands of oil). Even so-called "experts" have their prejudices, which are often no more reliable than the examples I just cited. Plus, you never know when the manufacturere might change their formulations.
But my engine didn't blow up with Rotella, therefore it has to be the greatest oil ever created <img src="/forum/images/smilies/968/biggrin.png" class="smilie" alt="" />
