Low oil pressure?

[Daniel Hussey <GY3WSX@vm.sc.edu>]

   Hey fellow listers,

   I have a '90 200TQ with dual knock sensor motor.  Wondering what normal oil
pressure is on this car.  I am presuming it is the notch right before the one
that reads 5 bar.  So, like 3.75-4 bar is normal pressure under acceleration.
My car's oil pressure used to sit there perfectly all the time.  I just changed
the oil to Castrol Syntec 10W30 and now my oil pressure seems lower than normal
Not bad enough to cause major concern, but it is resting a little before that
mark where it used to sit (before the one before the one reading 5 bar).  If
you follow what I am saying, where should normal oil pressure be at in this
car?  Sorry if I've caused any confusion.

   Later,
   Dan