I put a new all-metal radiator in a 94 Camry last November.
It now drips from the drain plug, which is plastic. Not a lot, about a pint per week-ten days
Do I wrap it with teflon tape? Or is that a no-no considering the high temp involved.
Or - do I find a brass nut to screw in there.
Don't want this thing to let go on the interstate this summer....

 

Pipe dope or teflon tape should do, just be careful how tight you go, and threads are clean. If not, take old drain plug with you & get a brass one from auto shop. Either one I'd use dope or teflon for insurance.