did you remove the filter & drain too?
ok, fill the sstf look straight down fill until you see reflection from the fluid.
Should just be around approx. 1L more
5-6L just doesnt sound right.
was your drain plug loose like mine?
Still on stock SST coolers right?
are you sure you only have two drain plugs?
I had 8.5L when I did mine with upgrade coolers.
I recently topped it off with 1L more it shifts much smoother.
CAUTION: remember small amount at a time & check again.
*Torque wrench all fill & drain plugs to 19lbs spec.*
Lmk what happens & how it turn out.