Has anyone tried these. Someone I know said it changed the temp on his MG from 3/4’s to half. Reviews for older cars look impressive too on Amazon and EBay. Could be £15 well spent. Works by reducing water tension and improves thermal conductivity of the water through the radiator. Last weekend at 60 on the motorway mine was getting closer than usual to the red, went down ok with heater on but last thing you want on a hot day.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/312163585462
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/312163585462