Denny, I too tend to err on the side of caution. I start new engines on mineral oil and run them for a short period ensuring compression. I then switch them to syn. The Ducati folks use a dyno break in on all their engines and can control the pressure loading on the new rings. Their engines never see mineral oil in the crank. I have worked on performance engines that never used syn. and had a bad hole due to rings. I am an ASE tech and a gear head so I like this type of info sharing..