Originally Posted by 2EHA
Originally Posted by dlundblad
Originally Posted by FordCapriDriver
As others have said Copper is protected fine by Extended life coolants as all coolants contain Azoles in one form or another.
However most extended life coolants contain 2-Eha which is known to be corrosive towards solder...
To protect solder, the best in inhibitor is Molybdate, which is found in G05, and most Fully Formulated diesel coolants.
Conventional Green contains Benzoate, which also protects solder.
So Extended life is fine in older radiators as long as it's a Non 2-Eha formula, but the safest best would be Conventional green or G05
Not saying G05 is a bad coolant, but is it 2-eha free? Their PI sheet makes no mention of it whereas the Zerex Asian vehicle does.
G05 is a first gen HOAT using sodium benzoate and also nitrates + silicates. original G48 is basically a silicated dexclone with a dash of some other weirdo benzoate in it.
all coolants protect yellow metals but attack solder to some degree. valvoline's tests makes it clear as day that dex and its derivatives are marginally more aggressive than others but still well within spec. absolutely zero reason to run conventional green in 2020
G48 is an evoltuion of the old school Volkswagen TL-774-C G11 Spec, G11 is ( usually ) a high silicate coolant with almost 600ppm Silicate + Benzoate + Borate and some form of Azole, G48 i think has slightly less silicate, around 500ppm like G40, , but instead uses usually 2-Eha or Sebacate, but it still has Borates + the Azole ofcourse.
You can get both 2-Eha and 2-Eha free versions of G40 and G48.
It's not that all coolants attack solder to some degree, the thing is that lead solder is perhaps the "weakest" most susceptible metal there is to corrosion in a cooling system, it's no wonder all modern cars use Aluminium / Plastic radiators.