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[grass doctor]

What's RMI?

RMI-25 is a low-cost, effective safeguard against cooling system failure. It cleans while you drive; inhibits rust, cavitation erosion, electrolysis and pitting; lubricates water pump seals and thermostats; and improves cooling.

 

[robocop75]

https://www.amazon.com/RMI-25-Cooling-System-Treatment-ounce/dp/B002HI94X2

 

[grass doctor]

but like Tguy mentioned it can expose any weakness in cooling system..ie rust holding stuff together...