Jocko_51_B3B Posted January 23, 2020 Report Share Posted January 23, 2020 Any opinions out there regarding the best kind of coolant to use in these old cast iron engines, IAT, OAT, or HOAT? Should it contain silicate or not? From what I've read, some coolants contain silicate, and some don't. I'm not even sure why silicate is added. One of my textbooks says that silicates can cause extra wear on water pump impellers although my B3B won't be driven that much anyway. Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted January 23, 2020 Report Share Posted January 23, 2020 good old green stuff 1 Quote Link to comment Share on other sites More sharing options...
kencombs Posted January 23, 2020 Report Share Posted January 23, 2020 IMO,that would depend on the radiator in use, not the block material. Good old copper/brass rad, good old green stuff. aluminum, take your pick of several formulas for cast/aluminum mix. I'd rely on the makers info. 1 Quote Link to comment Share on other sites More sharing options...
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