Thanks gents for the responses, it is a bit like the size of a small truck engine the flat 12 which holds 20ltrs of coolant
Just also been reading up further including the below, as these heating hoses run the middle of the chassis and up into the cabin (don’t want it rusting inside out) I think I will stick to EPDM and cost is 5x cheaper. Probably outlast me for another >36years:
Hmmm… However I was thinking of using waterless coolant when the system and engine gets completely drained, plus engine out belt change soon. Not sure if it mitigates the problems with permeability though…
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DRAWBACKS OF SILICONE
Permeability to oil and fuel
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Permeability to water molecules
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