From what I've been able to learn, both here and elsewhere, the U.S. Rotella 5-40 is a Group III+ and the Rotella 0-40, made and sold in Canada is a Group IV. I'm currently using the U.S. Rotella 5-40 (picked up half a dozen jugs, when I went to the "Destructive Devices" display in Knob Creek, KY. a while back). I also have a couple of jugs of the Can. Rotella 0-40, which I had intended to use in my '03 GL1800 - - however, I read (here) back at the beginning of the year, that the Can. 0-40, is not to be used in motorcycles, as it would/may adversely affect the clutch. Do any of you gentlemen have any further, or more recent information on this issue, that you could elaborate on - if so, your input would be most welcome. Thanks for reading - Doug