I am running a restomod FJ40 with a 5VZFE engine that has an Iron block and Aluminium head. The vehicle is using a copper/brass radiator.
Which coolant should I use to protect all the parts from corrosion? I live in Pakistan and have the options of using Toyota Long Live Or Super Long life, Aisin Red or Green, Dex-Cool and generic green coolants.
A side question: Will the copper radiator cause the aluminum head to corrode because of the galvanic effect?
Thanks for your help.
You should probably use the coolant the manufacturer recommends for that vehicle. Cars used to be built with aluminum heads and copper/brass radiators until the aluminum/plastic radiators became popular with manufacturers (cheaper). I don't think you'll have a problem with corrosion as long as a quality antifreeze is used.
I would just use any good modern coolant and change regularly. Galvanic corrosion happens when two dissimilar metals are in CONTACT, so you're fine.
The opening poster has an older vehicle with a brass and copper radiator (and probably has a heat exchanger that is fabricated the same way, with lead solder). Many modern coolants are not suitable for radiators/heater matrixes constructed this way - I have seen many solder failures caused by the use of OAT coolants in these older systems. The original poster should have been steered towards Toyota red coolant - which is a lon life coolant that is compatible with his vehicle components.