its 5 quarts +- .25
Ford is in the process of standardizing the markings across all vehicle lines. Current markings shown will be upgraded to a refined marking. Both markings will be used in production over the next few years. Oil levels will still be recorded in the crosshatched area of the blade, between the upper and lower limit holes. Vehicles shipped with engine oil levels falling within this area are acceptable and do not require topping off. Oil fill quantities are precisely measured at the plants and account for slight variations that may occur in oil pan volumes, indicator length, and pressed-in locations of the indicator tube into the block. For customer use, the markings continue to serve as a guide to refilling the engine to the correct initial fill volume with filter or, to top off the engine when it is determined the level is below the lower hole.
If the oil level falls between the upper and lower hole do not add more oil. Adding an extra quart could cause overfilling and may result in aeration (foaming) causing eventual damage to vital bearing surfaces and moving parts inside. Overfilling will require some oil to be drained out until the indicator shows the level between the upper and lower holes of the blade. DO NOT expect the engine to 'consume" the extra oil back down to the upper oil till level hole, or consider it as extra lubrication protection for the engine.
This is from the TSB on my 2002 GT