T5 and Mercon V?

as of this spring ford now recommends mercon V in all manual transmissions that used mercon III I can send the bulletin to you later....not sure if mercon v is better??but we can no longer get ford mercon III/dextron from ford !
 
That splains why I couln't find Dextron III/Mercon at Autozone. Choices were Mercon V or Dextron VI only. I picked up the Merc V because it said it was for Fords.

Closer examination says its for all Ford Mercon applications except Mercon SP or type F fluids.