Hopefully just an old gasket.
x2 this is a possibility. depends on how much milkyness, your whole pan of oil isn't going to turn milky from this.
Yes but there is alot of difference between milk and antifreeze.
Does the radiator have milk, if not no gasket problem.
Dipstick, valve covers showing milk, blow by past the rings or condensation.
I ran a 77 ramcharger for years sometimes it would blow the dipsick out of the tube, milk would be coming out. It was blow by past the rings.
I ran the the ram hard for many years on 44" tires and it was mudded hard every friday and saturday night, the motor never blew.
When I sold the ram it had over 250K on the original 318.
I bought the ram it had 70K all stock, one month later I lifted it, so 150K of complete abused was a good buy.