I do use Evans Waterless coolant in the Plus 4 but there are swings and roundabouts. On the plus side it has a very low vapour pressure so is unlikely to blow hoses off. It's also there for life and, since it is actually a kind of oil, it lubricates the water pump nicely. The downside is it's very expensive and (apart from in new/dry systems) a hydroscopic prep fluid has to be used to get all the water out of the system. Note bene: it is not permitted for racing since if it spills on the track it's as slippery as oil and does not evaporate.
I never would like to use such a liquid which can rise a danger in some circumstances. What can happen on a trac day can also happen on a normal road. The liquid must not be the culprid but a broken hose or a broken clamp can do so at every time.
