my 98 used the green prestone, ive noticed that my 99 DISCO II has some red audi/vw looking coolant, which is the proper coolant for the 99 DISCO II

 

D2s use the orange dexcool. Make sure you change it every 2 years or it becomes acidic and destroys gaskets.

 

Like AK said it came from the factory with DexCool, but if you do a complete coolant flush you can use ANY coolant that is ALUMINUM safe, that is the key, it MUST be safe for aluminum engines and radiators.
I recommend and use Peak Global Lifetime in the 50/50 premix.