These cars are 93s and 94s with between 40K and 95K on the clock. In my original post I included a picture, but in a subsequent edit I lost same and can't get it back! Oh well.
The car that has 2.5 bar at operating temperature and idle is a '91 with 120,,000 miles. I actually drove this car. All of the ones with low oil pressure are being sold on eBay. I can see the temp. gauge and have nothing else to go by.