I usually use our Coop's Sonic brand Global long life coolant. The other brand I usually get on sale and you will actually find is Prestone All vehicle long life coolant, supposedly good for 10 years. I have mixed it in various vehicles with no bad effects. I have mixed Prestone with Toyota's red coolant in a 1996 Toyota Tercel with 0 bad effects. When green and Dexcool are mixed, it literally makes modeling clay, not a pretty site. I mix it with the deionized water which is supposed to reduce corrosion and works as a battery top up as well, 50/50 up here due to -40, it is sold on the shelf beside it.