^
i just checked it and it says
mix/propotion --- protection
1. bottle (antifreeze) + bottle (water) + bottle (water) --- -20^C
2. bottle (antifreeze) + bottle (water) --- - 36^C
I guess option number one should be ok, because i believe we wont see -20^C
however how many litres of water do i need to put?, for example if its 9 litres, i will be putting 6 litres of water and 3 litres of anti freeze with summer coolant.
I saw -17c last year but Im in Scotland.