Have the mechanic test the motor with a mechanical oil pressure gauge just to
make sure that something isn't really wrong.  Then, what kind of oil filter
is on the motor?  Fram or a German one (Mann or Bosche)?  The Fram ones have
been known to make the oil light come on because they don't restrict the flow
of oil as much as the German ones and therefore your system has slightly less
pressure.  However this is not really a bad thing since less restriction
means more flow of oil, which is really want we want (nod your head here.)
 It could also be something about a pressure spring but the other guys on
this list know more about that than me so if they want to tell you about it
they can.  I think this disscussion is in the archives as well.  If your
pressure is good you can always put in a VDO oil presure gauge and rip out
the annoying beeping relay.  Hope I helped.
Ken Wilford
John 3:16