what antifreeze can i use in a 2005 jaguar s type 8 cyl

If it takes Dex Cool then it would say on the filler cap. Dex Cool is red in color, look into the reservoir to see. If it is green just regular 50/50 mix to top it off. Prestone is a good anti-freeze.

its orange

Then that is the Dex-Cool anti-freeze. That is what you have to put in.

And where can I get dex coolant ? as it doesn't seem available anywhere

auto zone