Quote
….Honda Type 2 and Toyota Longlife are free from 2-EHA salts. Suppose Mazda FL22 doesn't contain it too. ….
Currently no 'true' Asian PHOAT AF uses 2eha as inhibitor, that includes but not limited to all the Asian OEM AFs. WM Valvoline Asian Vehicle, ZAF, Pentofrost A2, A3&4 same. Peak Global Lifetime is a long service interval OAT AF with no 2eha.
That said, in new cars designed and spec'd for DexCool I'd have no concern about using it. The biggest issue according to the SAE paper linked, is incompatible gaskets, O-rings, and hoses. GM often noted for that with the LIM gaskets also use with non pressurized recovery tanks.
https://www.scribd.com/document/375...T-Antifreeze-for-Longer-Service-Interval
Perhaps 2eha was an issue with solder in older vehicles. As topic linked paper is from 1993, that could make sense. In new cars designed for DexCool, imo not an issue. The issue Ford seems to be having with their Orange Dex, doesn't appear imply solder issues. And afaik GM still using Dex in everything.
There have been several posts on this sub forum in discussions saying some of the Euro AFs use 2eha as inhibitor. Not being as familiar with them, can't say one way or the other.