There's a pretty good, long thread going on over at the DTR about the new "CJ Oils". Well worth the read, in my opinion,
Basically, it says that the CJ will work in the older-style engines but, if you are interested in extended oil drain intervals, you had better cut them in half. In other words, for those of us that are changing oil at about the 10,000 mile intervals, you may want to go to 5000 mile intervals.
Some guys that had racing/pulling engines were having premature wearing of the cam lobes & other parts of the engine. They didn't realize that they were using the new CJ until they started having the problems. They have since changed back to the CI-4+ & the problems have dissappeared. Sounds like these new oils are not as rugged as the old formulations, either. Those guys that have racing engines don't generally leave oil in the engine for very long & to have it wear out that early is a bit scary.
There is a good article by John Deere, in the DTR thread, that recommends using ONLY CI-4+ in their engines. Their testing showed that the CJ formulations didn't hold up well enough for them. Apparently, all the oil that JD sells, now, is CI-4+. So, that may be another source for you guys looking for the CI-4+.
Also, some of the smaller motor oil manufacturers, like Schaeffer's, will keep manufacturing the CI-4+ until, at least, 2010.
Joe F. (Buffalo)