jackb_ms Posted April 28, 2020 Share Posted April 28, 2020 Hello All.I've recently bought some OAT coolant from Halfords, the version which need to be diluted This one: https://www.halfords.com/motoring/engine-oils-and-fluids/antifreeze/halfords-oat-antifreeze-concentrate-5-litres-798785.htmlOn the Waring label it say to have a maximum of 60% OAT coolant.Would some one know why?Jack Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted April 28, 2020 Share Posted April 28, 2020 The heat transfer and freeze protection properties of ethylene glycol based coolants is worse in higher concentrations above 60% (freeze protection is highest at 65%, heat transfer gets lower as concentration increases). Typically 40% coolant to 60% distilled water for best heat transfer and reasonable corrosion protection, 60% coolant to 40% water for lowest freezing point and best corrosion protection, 50/50 for optimum properties overall.The boiling point of the coolant mix also increases with concentration, from 104°C at 40/60 to 107°C at 50/50 and 110°C at 60/40, but specific heat capacity (that relates to heat transfer capabilities) drops from 91% of pure water at 40/60 to 87% at 50/50 and 83% at 60/40. Link to comment Share on other sites More sharing options...
John Vine Posted April 29, 2020 Share Posted April 29, 2020 And, for info, I think we can safely assume the coolant is made for Halfords by Comma*, so my guess is that it's G30 concentrate.* That is, the phone number on the label (+44 (0)1474 564 311) is Comma's.JV Link to comment Share on other sites More sharing options...
jackb_ms Posted April 29, 2020 Author Share Posted April 29, 2020 Thanks gentlemen*thumbs_up_thumb* Link to comment Share on other sites More sharing options...
F111C Posted April 30, 2020 Share Posted April 30, 2020 I am sure I have heard a few comments that Radtek do not recommend using this coolant and blame it on radiator failures. It is meant to be ok with aluminium so I can not see why but can anyone confirm this and which coolant to use instead? Link to comment Share on other sites More sharing options...
EEK Posted April 30, 2020 Share Posted April 30, 2020 #5 - Go read the recent thread on K Series radiators Link to comment Share on other sites More sharing options...
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