As I'm mystified as to the premature failure of my water pump (replaced by the stealer under warranty) on a 2005 Hyundai Accent, I'm scouting around to replace the syrup the dealer replaced my G-05 with. Dunno if the original stuff the factory put in and sat in the car for a year and a half wrecked the pump, or if it was the G-05 i replaced it with when I bought the car.
Even the factory reps at Hyundai USA have no clue what they're talking about. They say use the 5 year/150K Yellow Prestone, but do NOT use DexCool. Well, that's nuts. The chemistry warning statement on the jugs of 5/150,000 mile yellow Prestone, and the licensed Prestone DexCool clone that I used for years on my old Hyundai (with excellent results) are identical. The Havoline coolant? Dexcool clone, they also list the same two organic acids listed in the "Big Two" Prestones and GM's original DexCool.
We know what's in G-05, a borate and a small dose of silicate to quickly repair damage to the OAT layer. The Dealer's mechanics, service manager and parts guys? When asked, they point to the big tank outside and say that is the stuff they use, but they don't know if it's a DexCool clone, a silicate, or if it's green mud, as they have no idea about any of the chemistry considerations to begin with, nor do they care. However, they ARE raking in the cash on water pump replacements. Dang, I'm cynical, eh?
So? Since I have a nice tight cooling system, the puke tank level rises and falls with the with the temperature of the engine (meaning my sealing is good, that is), I'm going back to my old friend, licensed DexCool Prestone which served my old Hyundai for 188,000 miles without any cooling system issues or peculiarities it worked. What a concept!