Mar 27, 2010 #1 M mrj1 New member Joined Jun 30, 2008 Messages 13 Reaction score 0 Points 1 i think the engine is a 4.0, but i'm not completely sure
Mar 27, 2010 #2 M mechkman New member Joined Mar 19, 2010 Messages 2 Reaction score 0 Points 1 Five quarts is the norm, for a 1998 gmc pickup.
Mar 28, 2010 #3 R rustynail Member Joined May 14, 2008 Messages 34 Reaction score 0 Points 6 At least 6 quarts of oil for the average full-size pickup truck.