Well we have 6, 6 1/2 and 7 quarts as to the replies on here, I just changed my oil over the weekend and it took 6 1/2 quarts this time with the motor craft oil filter.
6 quarts reads low on dipstick but not under the mark, 6 1/2 quarts has the oil level near the top but not on or over the mark.
Yes the manual say 6 but my dipstick says 6 1/2.
I never got the memo and never heard of the dip stick issue was on the 07 F-53 chassis.
Also to note I have always used around 6 1/2 quarts for the past 6 years without any issues or seal leakage and I never have to add oil even after 1 year.