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I've had great luck with Redline Water Wetter; I'm sure it's a similar product. Amsoil and Royal Purple each have their versions of the product too.
A warning regarding Redline's product: even though all these products perform about the same, it's the oldest one out there, and uses an older formulation, which creates clot. Redline no longer has anyone working on this product, either, so you won't get help from them.
This pic above is from the coolant I drained from my supercharged Miata. It happened after I added Redline water wetter and hit 240 degrees F coolant temp. I did research after that, and learned that it's a known issue.