There is some negative history with 2-EHA and Asian manufactuers have consciously chosen not to use it.People's irrational fear over 2-EHA is based on the fact that it is a plasticizer, but the fact that the sebacate used by the Japanese coolants is also a plasticizer is conveniently overlooked. Many OEM's like VW, Audi, Mercedes, Porsche, Jaguar, etc use coolant with 2-EHA without issue, so if you want to needlessly worry about 2-EHA than you should also be needlessly worrying about sebacate.
The concern is compatibility with hoses, gaskets, and such. The other OEMs may be using different materials.
I'm not intimately aware of the science here, so I would just play it as safe as possible.