It holds 25 gallons
It will hold 5 quarts exactly with a filter change.
According to the 2004 Ford Excursion Owner Guide : ( 44.0 U.S. gallons )
15.7 gallons
22.5 gallons
28 gallons 28 gallons
18
( 44 ) U.S. gallons
( 28 ) U.S. gallons
18.0 U.S. gallons
15.7 gallons ( according to the Owner Guide )
15.7 gallons according to the Owner Guide