Hi,

apparently my guy has a iron block with aluminium heads, so which coolant do I use? The problem I'm having with internet research is that different countries have a different colour-coding system... or so it seems. So please give more info than a colour.
The manual says to use an ethylene glycol based one that is compatible with aluminium parts.
But even then, it's not clear:

Silicate / silicate-free?
Ones for aluminium engines? Or not?
With or without nitrate?

Thanks.