The 1998 F-150 owners manual shows ( 5 W 30 ) for all engines
If it is an automatic the best thing to use is Chrysler automatic trans fluidAnswerMost 1998 Ford F150s take Mercon V Transmission fluid
Mercon V ATF as per the owners manual and Ford
DOT ( 3 ) brake fluid
Department Of Transportation ( D.O.T. ) 3
5W-20 ( according to the Owner Guide )
the transmission that is in a 1996 f150 is a 4r70w if automatic
Ford recommends 5w20
According to the 2003 Ford F-150 Owner Guide ( 5W-20 )
R134a
D.O.T. ( 3 ) brake fluid ( meeting Ford specification ESA-M6C25-A )
The type of fluid required is written on the dipstick.
" regular " unleaded , 87 octane