According to the 1998 Ford Mustang owners manual ( 5 W 30 )
The Ford recommended oil weight is 5w-20
5w30 mobile one 15000 mile guarateed
( 5 w 30 ) for your 4.0 liter - SOHC - V6 engine according to the 2008 Ford Mustang owners manual
The oil pan is bolted to the bottom of the engine
A 1998 v6 Mustang uses 10w30 oil. Oil reduces wear on parts, cleans, inhibits corrosion, improves sealing, and cools the engine by carrying heat away from moving parts.
10w-30
( 5 quarts ) with filter change - according to the 2000 Ford Mustang owners manual
5 w 30
( 5W-20 ) according to the 2004 Ford Mustang Owner Guide
5qts 5qts
5W-30 , according to the Owner Guide