OAT ( organic acid technology) which is usually red, but can be any colour there's no standard.
50/50 is the correct mix for the 300 series. But before u use it u must remove all the remaining old antifreeze mix, I've been using OAT for the last 15+ years but before using the stuff I flushed the cooling system four times, that's drain, fill with water, run the engine and drain...refill run the engine etc. The existing was Land Rovers green/yellow antifreeze replaced every 3 years.
Replacing the OAT antifreeze every 5 years sold the stuff to me.
I also own a 40 year car the antifreeze for that is the old school stuff which is blue and is replaced every 2 years.
New cars the factory antifreeze fitted doesn't get replaced until the vehicle is 8 or10 years old, I believe that the same with LandRover.