Originally Posted by http://www.imcool.com/articles/antifreeze-coolant/G05-Glysantin.php
What’s a HOAT? Hybrid OAT in this case means it has a traditional Ethylene Glycol-base, with a single OAT inhibitor and is moderately silicated. The version now being installed by DC, and tested by Ford, is based on the German BASF product, Glysantin G 05. It has been used in extensively in European Mercedes Benz and other manufacturer’s vehicles since the late 1980’s. New users expect that it will provide the 5-year, 100K miles coverage they desire. G 05 proponents believe that its moderate dose of silicates provide greater aluminum protection than a straight OAT while still being water pump friendly.