No such claim has ever been made for synthetic oils. Energy conserving oils, almost all of which happen to be synthetic have made claims of reducing friction, but that's it. Synthetics are more durable in several ways, and their formulation is better controlled by virtue of the fact that they are manufactured, rather than refined. Well maybe i got that thought in my head because of the commercial for mobil 1 that shows motors going for 200k miles with virtually no wear. Lack of wear is not caused by a lack of friction, but by a lack of any contact between the load bearing surfaces of the engine's moving parts. That is what oil should do.