According to the 1998 Ford Windstar Owner Guide :
With engine oil filter change :
Both the 3.0 and the 3.8 liter V6 engines take :
( 4.3 liters / 4.5 U.S. quarts of 5W-30 engine oil )
According to the 2002 Ford Windstar Owner Guide : With engine oil filter change ( 5.0 quarts )
According to the 2002 Ford Windstar Owner Guide : With engine oil filter change : The 3.8 liter V6 engine takes : ( 5.0 U.S. quarts of 5W-20 )
The 2001 Ford Windstar Owner Guide shows : With engine oil filter change ( 5.75 quarts ) Personally I would try 5 quarts first and see where it is on the dipstick
According to the 1996 Ford Windstar Owner Guide : With engine oil filter change : Both the 3.0 and the 3.8 liter V6 engines take ( 4.5 U.S. quarts of 5W-30 )
With engine oil filter change : The 3.0 liter V6 engine takes ( 4.5 quarts ) The 3.8 liter V6 engine takes ( 5.0 quarts ) according to the Owner Guide
According to the ( 2003 ) Ford Windstar Owner Guide : With engine oil filter change : The 3.8 liter V6 engine takes ( 5.0 U.S. quarts of 5W-20 )
According to the 1999 Ford Windstar Owner Guide : With engine oil filter change : The 3.0 liter V6 engine takes ( 4.5 U.S. quarts of 5W-30 ) The 3.8 liter V6 engine takes ( 5.0 U.S. quarts of 5W-30 )
The 1998 Ford Windstar Owner Guide shows ( 4.5 quarts with engine oil filter change ) for the 3.0 liter and 3.8 liter V6 engines
4.8 quarts
V6 ENGINE 5.0 Quarts V8 ENGINE 6.0 Quarts
On a 2001 Ford Windstar : The 3.8 liter V6 engine has ( 6 engine cylinders )
( 5 quarts ) with engine oil filter change