Jomar, no I'm not. South Texas Pollock is my ole CB handle, not my name.

Greg brings up a good point. Why do the high end cars come with synthetic on the factory fill?

If you've ever cooked the oil (be careful) and see whats left at the end or seen pictures of someone who did it pretty much tells the story. The old base crude winds up a black gooey mess, not so the synthetic. If you think about the oil being sprayed onto the underside of the pistons on our engines to cool down the pistons and with some guys running from 1400 to 1700 degrees exhaust temps on short spurts of major dyno runs, you can just imagine what happens when that oil hits the piston thats starting to approach melt down temperature. I would think the ones using conventional oils whould have a build up of carbon under there which will just stay hot and become an insulating layer to keep the oil cooling from doing its job and eventually....a hole right in the center of the piston.
For that reason alone I will always use a synthetic if the pistons are oil cooled like the duramax is.