Quick coolant versus de-ionised water ratio question

[Juddder]

Got a few mates helping me on Wednesday night doing a complete cooling system change, and just checked up on the ratios of Coolant concentrated versus de-ionised water

Euro parts Blue is saying on the instructions either

1 anti-freeze to 1 water = 50:50 mix - Up to -36c

1 anti-freeze to 2 water = 33:67 mix - up to -20c

as their recommendations, however the TVR service manual is saying

15 litres - 3 parts water, 1 part anti-freeze

Anyone know which is the best to go with (seeing as we are more worried about keeping the car cool than hot I would expect)?

Thanks in advance

Edited by Juddder on Monday 8th February 16:38

[pmessling]

I've always done 50:50

I've just removed all my hoses and pipes to get the steering rack out so will be needing to do it all again.

[gruffalo]

pmessling said:

I've always done 50:50

I've just removed all my hoses and pipes to get the steering rack out so will be needing to do it all again.

Ditto.

[Juddder]

Awesome - thanks guys