OAT coolant

[jackb_ms]

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.html

On the Waring label it say to have a maximum of 60% OAT coolant.

Would some one know why?

Jack

[aerobod - near CYYC]

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.

[John Vine]

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

[jackb_ms]

Thanks gentlemen*thumbs_up_thumb*

 

[F111C]

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?

[EEK]

#5 - Go read the recent thread on K Series radiators