Update :
I found a 2011 F53 manual online and it shows 7 quarts for the oil capacity, Ford made no changes on the V10 or the tranmssion from 2006 to 2015..
So it appears the manuals might be wrong on the 2006 to 2009, could not find the info on 2010.
And the dipsticks might be wrong as well on these years 2006-09, 7 quarts puts my reading slightly above the high mark and 6 quarts puts my reading at the low mark, 6 1/2 quarts puts me in the sweet spot..
So if you are putting in 6 quarts you might be running the oil level to low on the 2006 to 2009 F53's if you go buy the manual..
:C
Another Ford screw up...