Have a 2006 Ford F550 6.0 turto deisel. Why is my oil not milky but my antifeeze is?

Have a 2006 Ford F550 6.0 turto deisel. Why is my oil not milky but my antifeeze is?

You've got compression forcing oil into the coolant, but not into the oil. Most likely, a blown head gasket that has blown between the cylinder and a coolant passage.

Because it's been cold out. You still have a bad head gasket

Head cracked again.

Or a bad oil cooler