This subject has been hashed over on every muscle car/sports car board for years with most of the comments being anecdotal and very few citing SAE or other scientific evidence to back up their opinions. So what's the truth? Is synthetic better than dino oil and, if so, which brand is best? The only way to find out is to use double blind research and test each brand in the laboratory or in automobiles for extended periods of time where neither the testor or the testee knows which oil is being used. The results are there. I don't belong to the SAE so I can't download the scientific data but there is a good comparison test by Amsoil on it's website which shows the comparative performance of many of the popular brands of oils. It's good reading.
http://www.amsoil.com/products/atm_t...dex_flash.aspx