Originally Posted By: Fordiesel69
G-05 would be an excellent choice, just get jugs that don't list 2-EHa in the ingredients.
Looking to buy some jugs of zerex G-05 and zerex conv green for my crown vics & lincolns. What is all the hype of 2-EHA and how do I know if the coolant has it?
2-EHA is the particular organic acid that is used in DexCool and the "DexClones." It works well as a corrosion inhibitor, but its downside is that it attacks some gasket materials. This is what is believed to have caused the rampant lower intake manifold gasket failures in many GM engines. Its anybody's guess what 2-EHA will do to older engines, and depends on things like whether or not the coolant even contacts a susceptible gasket. Engines that pass coolant through the intake manifold gasket are much more susceptible than ones that dont, but since all engines pass coolant through the head gasket that may be a risk.
You likely won't see "2-EHA" anywhere on any antifreeze label, but you may see "ethyl hexanoates" in the ingredients list. "Ethyl hexanoates" generally means 2-ethyl-hexanoic acid, which is 2-EHA.