Zig, you may be right, but according to our manual, break-in for our cars is only 1,200 miles. That break-in argument was more valid 20 years ago when engines really did need to break-in. It was important for certain parts to form fit slowly and for other part to have rough burrs worn off slowly under light load. The belief was that the synthetic was so slippery compared to regular oil back then, it prevented that necessary wear. Today's engines don't need that kind of major break-in anymore. That is evidenced by the fact that all of today's mega-buck Ferraris, Porsches, Corvettes, etc. all come with synthetic straight from the factory. If those cars get synthetic from day one, I say there is no problem with us changing to it after the first oil change, which coincides with the manual's break-in mileage.