Originally posted by: sao123
And now these messages from your actual local mechanic.
At one point in time, it was necessary to wait 1-2 oil changes for break in, before switching to full synthetic because it would cause the engine seals to leak.
Synthetic oil has been reformulated within the last 5 years to eliminate this problem.
Several cars now actually use full synthetic direct from the factory.
Cadillac CTS, XLR, SRX and STS
Chevrolet Corvette
Dodge Viper
Mercedes-Benz
Mitsubishi EVO
Pontiac GTO
Porsche
Chrysler Crossfire