i have found this to be true on brake cylinders or power steering
housings, wheel cylinders, and basically any part that is made from a
casting or stamping where the original manufacturer of the item is also
the supplier to a major auto  maker.  you will find this on girling,
ate, raybestos, sachs, and many others.  i only became aware of it
recently  but checked our stocks at the store and then called some of
our dealer  liaisons to check  their parts.  the casting/stamping will
have both markings on it and if the maker is sending it to the auto mfr
then he grinds (polishes is the term used) of his marking and leaves
the automakers.  if he  is selling to the general parts trade then he
grinds of the car manufacturers markings.  this is  also the reason
many rebuilts have no markings on them and two polished spots if they
havent been resurfaced.
jimt
On Tuesday, Oct 1, 2002, at 14:51 America/Denver, The Bus Depot wrote:

> claim that it is relatively common among OE suppliers of VW parts for
> them
> to grind off the VW logo.  As I understand it, this is because the
> manufacturer may only be licensed to use the VW logo on inventory that
> he is
> private-labeling for VW, but not on inventory that he is selling
> directly
> under his own brand.  It does not necessarily imply that the product
> is a
> second.