The Japanese automotive manufacturers use phosphated (P-OAT) coolants for a reason. See the article "Coolant Development in Asia" at
http://www.astm.org/JOURNALS/JAI/PAGES/JAI100368.htm.
Ford evidently has been convinced of the merit of P-OAT coolant technology as well. Ford recently started using rebadged Mazda FL22 coolant (instead of G-05) in vehicles that rely on joint Mazda/Ford engine technology. Mazda FL22 is an extended life (second generation) P-OAT coolant. In contrast to North American and European coolants (e.g. G-05), Japanese P-OAT coolants were developed primarily for aluminum engines.
In cars with aluminum engines, I would steer clear of silicate-free, phosphate-free OAT coolants like Peak Global Lifetime. Most of these coolants are Dex-Cool clones. Peak Global Lifetime reportedly contains no 2-EHA but uses other organic acids (which Old World Industries will not reveal) isntead. Peak Global has no phosphates and there is no evidence that it even contains the same OAT package as the Asian coolants. For the record, CCI Corporatoin, the Japanese company who developed P-OAT coolant technology, is a dominant force in contract manufacturing of coolants in North America. They bought Dow's coolant business about 10 years ago and it appears that a large fraction of North American coolants (including Zerex coolants, Peak coolants, Motorcraft coolants and private label coolants from Wal-Mart, Advance Auto, O-Reilly's Auto Parts) are actually manufactured by CCI. They all come in exactly the same bottles, which are identical to the bottles used by various Japanese OEM coolants, e.g. Toyota Long Life and Super Long Life coolants and Mazda FL-22 coolant). Japanese automotive engineers hate 2-EHA and none of the CCI OEM coolants contain 2-EHA. But CCI manufactures a large volume of coolants containing 2-EHA under contract for other companies.
I am glad that Zerex is finally marketing a Japanese (CCI chemistry) coolant. Now those of us who believe in the superiority of P-OAT coolant technology do not have to buy Japanese OEM coolants.
For more information on the CCI coolant empire, check out:
http://www.ccijp.co.jp/en/index.html
http://www.cci-il.com/en/home/default.aspx