Rear differential oil capacity in 200q

[RJA]

I am replacing the rear differential oil in my 200q with Redline and would
like to know the oil capacity.  I've checked Bentley 10 times over and the
only reference I can find is for the 100q differential, which shows it as
1.8 qts.  Anyone know what it should be?  So far I've put in a little over 2
qts without reaching the fill port (on level ground).

-- Rich
   '90 200q
   '83 Coupe GT