A 2002 Ford E250 Van with 4.2L V6 requires 6.0 quarts of oil, and the manufacturer recommends a 5W20 synthetic oil.
Take it to a Ford garage or someone who is familiar with Modulators
Take off the camshaft.
On a 2006 Ford E-250 : The GASOLINE engines take ( " regular " unleaded , 87 octane )
4 quarts
$300 give or take $20 depending on where you take it.
The 2002 Ford Taurus Owner Guide shows ( 5W-20 )
5 litres according to the Garage - I had to ask today!
According to the 2004 Ford E-250 Owner Guide : With engine oil filter change : The 4.6 liter gasoline V8 engine takes : ( 5.7 liters / 6.0 U.S. quarts of 5W-20 )
Take your 2002 Ford Ranger to the garage to get the engine checked.
According to the 2007 Ford E-250 Owner Guide : With engine oil filter change : The 4.6 liter gasoline V8 engine takes ( 6.0 U.S. quarts / 5.7 liters of 5W-20 )
Take it to a mechanic...
Ford was appointed CEO of Alltel in 2002