My 1998 E350 takes 6.4 litres, just changing last night
According to the 2003 Ford F-350 Owner Guide : With engine oil filter change : The 6.8 liter GASOLINE , V10 engine takes : ( 5.7 liters / 6.0 U.S. quarts of 5W-20 )
According to the 2001 Ford F-350 Owner Guide : With engine oil filter change : The 6.8 liter V10 takes ( 6 quarts / 5.7 liters of engine oil )
Seven quarts.
According to the 1999 Ford F-250 Owner Guide : With engine oil filter change : The 6.8 liter V10 gasoline engine takes ( 5.7 liters / 6.0 U.S. quarts of 5W-30 )
7 quarts
According to the 2005 Ford E-350 Owner Guide : With engine oil filter change : The 6.8 liter V10 gasoline engine takes : ( 6.0 U.S. quarts / 5.7 liters of 5W-20 )
According to the 1999 Ford F-250 Light Duty and Super Duty Owner Guides : With engine oil filter change : ( the 6.8 liter V10 gasoline engine takes 6.0 U.S. quarts / 5.7 litres of 5W-30 )
According to the 2002 Ford Excursion Owner Guide : For the 6.8 litre gasoline V10 engine : With engine oil filter change : ( 5.7 litres / 6.0 U.S. quarts of 5W-20 engine oil )
7 quarts
I was looking at various model year Owner Guides for the Ford F-250 and they show for the 6.8 liter V10 gasoline engine : With engine oil filter change : ( up to the 2004 model of Ford F-250 , 5.7 litres / 6.0 U.S. quarts ) ( 2005 and newer models of Ford F-250 , 6.6 litres / 7.0 U.S. quarts )
According to the 2001 Ford Excursion owners manual : With engine oil filter change : ( 6.0 quarts of engine oil ) for the 6.8 liter V10 gasoline engine