According to the 1997 Ford F-250 Heavy Duty owner Guide ;
With engine oil filter change :
The 5.8 liter / 351 cubic inch V8 engine takes :
( 6.0 U.S. quarts / 5.7 liters )
* 5W-30 is the PREFERRED oil for the 5.8 liter V8
6.0 gallons
It should be the 6.8 liter engine and the capacity is 6 quarts
In a 1997 Ford F-250 *** LIGHT DUTY *** (YES , the 4.2 liter V6 engine was available )
'03 6.0 takes 15 quarts. '04 should be the same.
According to the 1997 Ford F-250 Heavy Duty owners manual : With engine oil filter change : The 5.8 liter / 351 cubic inch V8 takes ( 6.0 U.S. quarts / 5.7 litres of engine oil )
7.5
7.3 Liter Turbo
According to the 2003 Ford F-250 Owner Guide : With engine oil filter change : ( the 5.4 liter V8 engine takes 5.7 liters / 6.0 U.S. quarts of 5W-20 engine oil )
4 gallons
The 2009 Ford F250 6.4 liter diesel pickup truck has a listed towing capacity of 8500 pounds. The manufacturer recommends that you do not exceed the towing capacity.
( .044 inch ) for the 5.8 L / 351 cubic inch V8 engine in a 1997 Ford F-250 , according to motorcraft.com
In a 2004 Ford F-250 : Gasoline engine choices ( 5.4 liter V8 and 6.8 liter V10 ) Diesel engine ( I believe that is 6.0 liter )