actually i unhooked and bled so many times its mainly just water now, not a problem as it hardly ever freezes here, and the ambient keeps the water in a good temp anyway, really all you need to add is something to keep rust out or keep it from freezing if you putting outside, but then watch out for condensation on blocks that getting cold water indoors.
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i think i talked to u on youtube
ur not using oil ur using that synthetic stuff?