Originally Posted by Leingod

Question when refilling coolant. My dad bought this gold stuff in a bottle you supposedly just poor directly into the rad and let the car run. I personally want to drain the coolant first, add new stuff and top off with that gold stuff. Think it's worth it? He has a very slow leak and this gold stuff will supposedly close the holes or whatever.

This is for an Acura MDX btw. Manual states to not do a complete flush. Just drain and refill.