Like I said it is most likely a myth like needing to rotate radial tires
only front to back. We now know that we can rotate radial tires any which
way and I believe we can break an engine in better with synthetic oil.

William

> I have wondered about this also. Lexus for example uses synthetic from the
> get go. Their engines seem to break in just fine. any theories???
>
> Ed
>
> >There are however a couple of high end automobile companies that install
> synthetic motor oil at the factory in their new >automobiles and who's
> engines never see anything but synthetic oil, one is Porsche the other I
do
> not remember.