Its called Dex-Cool, any autoparts store carries it.
DO NOT USE DEX-COOL!!
Look at the pictures page.
Drain your cooling system, flush with clean water and refill with any aluminum safe coolant you want.
I prefer Peak Global, just make sure you buy it in the 50/50 premix.
The "Storm Trooper", 1997 Discovery with 245,000 miles, still a daily driver.