5 w 20
It should tell you on top of your oil fill neck on the engine. My Ford Escape does.
According to the 2007 Ford Expedition Owner Guide ( 5W-20 )
It depend on what oil do you like using. I personally used Castrol 10W40. On my 1998 Ford Expedition XLT.
Ford recommends 5w30 to be used. There are no recommendations as far as synthetic vs conventional go.
5W/30 motor oil
According to the 1998 Ford Expedition Owner Guide ( 5W-30 ) * with engine oil filter change , 6.0 U.S. quarts of 5W-30 engine oil
According to the 1997 Ford Expedition Owner Guide ( 5W-30 ) * with engine oil filter change , 6.0 U.S. quarts of 5W-30 engine oil
motor oil
As long as is motor oil 10w30 or 10w40. You should be fine. Just make sure you put the oil in the correct destinations. for example ; Motor oil in the motor. Transmission oil in the transmission.
same as motor gn4 Honda motor oil
There is a cap on top of the valve cover.