The Corvette's have been facotry filled with synthetic oil for several years. They even come with a oil cap the says, Special Lubricant Required and the Mobil 1 Logo. GM part number for that cap is12555685, go buy one if you doubt me, its around $7. Also it been said by Scott Settlemire, Camaro Production Team that all F-Bodys were alos filled with synthetic oil starting in Sept of 2001. They also installled it in prior years. So the breakin therory does not seem to make any sense. I personally install synthetic oil in everything I own as soon as possible.
btw-I use Amsoil synthetic's. They are made in the USE (Superior, Wisconsin) and not a product of the bigh oil companies.
2002 Trans AM WS6 #3124 6-sp Hurst 2001 GMC SLT Ext Cab Z71 1992 Chevy Silverado SWB 4X4