Has anybody used any of the Duomond Tech oils? One of the local Yamaha parts/service places say it is the greatest stuff since sliced bread (but this is the same place that didn't know that the 426's had oil strainers). I think they like it so much because it sells for $36/gallon. I tried some on my last oil change and my tranny did not seem as smooth as it usually is, and I had a number of missed shifts which is a rare occurence for me. I think I've made my decision...going back to Rotella syth., just wondering if anybody else has tried this stuff.