There's been much talk over this subject. Truth being that there are a lot of manufacturers that use synthetic oil right from the factory in new motors, some of which are listed below. There is no reason to wait for the 100/1000/5000 mile check to change to synthetic oils and your rings will seat fine with synthetic oil right from the beginning.
Some manufacturers are...
Aston Martin
Bentley Amage and Bentley GT
Cadillac CTS, XLR, SRX and STS
Chevrolet Corvette
Dodge Viper
Mercedes-Benz AMG vehicles
Mercedes SLR
Mitsubishi EVO
Pontiac GTO
All Porsche vehicles
Harley CVO (screamin eagle) bikes (syn3)
2007-2010 Ford Shelby GT500
Some manufacturers are...
Aston Martin
Bentley Amage and Bentley GT
Cadillac CTS, XLR, SRX and STS
Chevrolet Corvette
Dodge Viper
Mercedes-Benz AMG vehicles
Mercedes SLR
Mitsubishi EVO
Pontiac GTO
All Porsche vehicles
Harley CVO (screamin eagle) bikes (syn3)
2007-2010 Ford Shelby GT500