I'm not sure what came in my BX2200 (purchased in 2000), but when I had it in for service recently, I asked svc. mgr. to be sure to put Super UDT in when changing fluid. He said, "What in the world for?" I replied that the owners manual says so and most guys on TBN recommend it. He told me that since our annual temperature range is normally from 30 to 111 degrees (though I have seen as low as 17 here and as high as 115), they always just put in UDT. He said, "Unless you live up in the Sierra where it gets pretty cold, there's just no real reason you need the Super. You're just spending extra money with no added benefit." Based on that, I went ahead with the regular.