I just got a 98 f150 with the 4.2 v6 it's leaking antifreeze into the oil guy said it was the intake manifold gasket could it be or is the engine just junk.
Very well could be, the intake is cooled by the antifreeze flowing through its water jackets. Galaxy S4 Cetane Powered Android
or if the radiator has oil cooler lines going into it it could be a bad radiator internally but more than likely its head gasket so the motor is junk