4.6 and 5.4 are using 5W30
The 1998 Ford Expedition Owner Guide shows ( 5W-30 )
The 1998 Ford Expedition owners manual shows ( 5W-30 )
A 1998 Ford Expedition with the V8 4.6L engine requires 6.0 quarts of oil.
The motor oil, in your 1998 Ford expedition, should be put in the oil fill tube. The oil fill tube should have a That labels it as the oil fill tube.
On a 1997 or 1998 Ford Expedition ( 5W-30 ) * with engine oil filter change , 5.7 liters / 6.0 U.S. quarts
On my 1998 Ford Expedition XLT. The oil filter was located on the drivers side behind or near the front bumper.
( 6 quarts ) with engine oil filter change ( according to the 1998 Ford Expedition Owner Guide )
My 1998 Ford Expedition XLT (4.6L) takes 6 qts of Castrol Motor Oil with a new oil filter.
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
5W-30 ( according to the 1999 Ford Expedition Owner Guide )
It depend on what oil do you like using. I personally used Castrol 10W40. On my 1998 Ford Expedition XLT.
The 2001 Ford Expedition Owner Guide shows ( 5W-20 )