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good oil resistance and the ability to withstand high joint movement
Sounds like the right sort of stuff, but I've never used it.
I have hylomar blue for the sump plug threads in my lube box, so that's was large part of the suggestion.
TBH give that it's coming into contact with coolant rather than oil or petrol its probably not all that important what you use.
hugo7
@pryally
that's great thanks, would LOCTITE SI 5980 Flange Sealant work as well? I can pop into Halfords on the way home and get some.
I'll check torque specs but I only ran it for a couple of minutes (doing a drainage flush, prior to filling with new coolant) and it started leaking