What the hell are you talking about? There is no fact to that satement at all! Infact, new BMW's and VW(at least the diesels) REQUIRE it from the factory from day 1!
My family has been running Amsoil for a LONG time, we have NEVER had problems with our cars "not" breaking in.
I've been running Amsoil since 600 miles and its been great so far. I would HIGHLY suggest that if you run Amsoil you become a dealer. You save about $2/quart by doing so. Its like $50 to become a dealer and $10/year to renew. After shipping I pay about $5.20/quart being a dealer. That, and my whole family uses it now, so it justifies the cost a little more.