It's funny how this subject comes up on all the sites(Vette,LS1,GN) sites I subscribe too.
Basically, the arguments and opinions are the same on all the sites. However, the problem is that many of the opinions are just that "opinions", based on observations or bad rumors or old wives tales.
If you really want to know if synthetic is better than dino oil for your daily driver, occasional racer, or full time racer, there's a couple of reliable and independent sources of information; The Society of Automotive Engineers and American Petroleum Institute.
It is safe to say there have been hundreds of independent, clinical tests of both types of oil, tests where two identical engines for example are run on dynos, for extended periods of time, under different loads, and then torn down and analyzed for wear.
Mobil 1 may still advertise itself as the "million mile" oil after one of those tests involving a BMW engine. They ran the engine for a million miles and then tore it down and found no appreciable wear. It's, of course advertising, but, if the test was run by an independent lab, and not Mobil Oil, then it's an example of an unbiased test of these oils.
I'm sure there are probably dozens more tests involving other synthetic and dino brands of oils.
All oil is a blend of different qualities for one purpose, preventing wear, suspending contaminants, heat and cold flow, etc. What works in a race car where heat and thermal breakdown are a concern, would not work so well in a daily driver where stop and go driving and cold winter starts mean that contaminents and cold flowing properties may be more important.
The consensus, as far as I have read. If you're driving your TB as a daily driver and only occasionally going to the track, then a good Dino Oil that you change every 3k is probably okay. You can spend the extra money for a synthetic to provide more wear and heat/cold protection but it may not give you better service.
