It depends on which engine you have. 4.6L engine: Use SAE 5W-20 engine oil. 4.0L engine: Use SAE 5W-30 engine oil. You can find all of this information in your Owner's Manual. If you don't have one, here is a PDF of the 2004 Explorer Owner Manual.
where is the fill port on a 2004 ford explorer rear end
5W-30 is the preferred oil ( that's what I've used in my 1995 Ford Explorer since 1995 )
what is the answer to the question?
For the 4.0 liter V6 engine ( 5W-30 ) For the 4.6 liter V8 engine ( 5W-20 ) According to the 2004 Ford Explorer Owner Guide
Absolutely , the engine in a 2004 Ford Explorer needs an engine oil filter ( or your engine will only last a few seconds while the oil pumps out on to the ground )
5 quarts with engine oil filter change
If you have the owner's manual, it usually says what kind of oil you need in there.
summer: 10W30 winter: 5W30
For the 4.0 liter V6 engine ( 5W-30 ) For the 4.6 liter V8 engine ( 5W-20 ) According to the 2004 Ford Explorer Owner Guide
It should have oil service every 5,000 miles.
The 2004 Ford Explorer , WITH A FILTER CHANGE TAKES: 5 American quarts for the 4.0 L V6 6 American quarts for the 4.6 L V8
4.0 liter V6 engine ( 5W-30 ) 4.6 liter V8 engine ( 5W-20 ) According to the 2004 Ford Explorer Owner Guide