I used it at a 40% concentration in a hydronic heating system for years. It has a better specific heat than conventional EG. It was in the system for probably 15 years and looked great when I drained it. However, there were no aluminum or gaskets in the system. Never had a circulator problem and the inside of the boiler was like new.

My signature car has always gotten official MB coolant until the last change when I went to NPG. I don't see the purpose of saving a couple of dollars a gallon on coolant and the risk of problems it entails.

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'83 300D, 126K miles.