So at 70K miles I want to perform a coolant flush on the Escape. I've learned (here) that Motorcraft Premium Gold coolant = Zerex G-05, available at NAPA parts stores. But here's the deal: I want to do a complete drain, not just the radiator. Is there also a coolant drain plug on the bottom of the Duratec block that can be pulled to drain coolant sitting in the engine? And do you really need to put in any anti-leak pellets after a thorough drain and fill?