Hello all. Recently bought a used (2016) mazda 6. Car's been to Mazda approved garage for a pre sail check so not too worried but just wondering what coolant would I use for it in the future? Is it f22, what color is it? I have seen that mazda are selling they'r own coolant. Is it best to use that? It quite hard to see the level of it in the tank as well. Do you just top it up to max mark or doesn't it need to be replaced all together? Thanks!