truthfully.....its better to not even mess with it unless it bad or leaking.... I do coolant flush but never touch the plug drain....just asking for problems....should the plug be rusted, stuck or grind out the threads as you unplug or replug it.....
I just do the radiator bottom drain plug, refill and purge the system....
I just do the radiator bottom drain plug, refill and purge the system....
