I've decided that from now on i'm going to use Silicated OAT coolants like VW G12++ and G13 ( Glysantn G40/GG40 ) on any car i own, no 2-Eha, and they have no problems with copper, brass or solder, and they especially give excellent results with regards to Aluminium corrosion, they don't have problems with Silicate dropout or gelling and last 5 years like other OAT coolants.