Go with OAT. I switched to Dexcool, and every local shop here is peeing on themselves trying to get me to get it out of my truck.....

 

Dexcool eats gaskets. I dont care what anybody says, it eats gaskets. All GM Goodrich mechanics will tell you that as soon as your car is out of warrenty replace the Dexcool with anything else. GM cars blow head and intake gaskets around 100k because the Dexcool eats the gaskets. THAT IS A FACT. Just ask a GM mechanic.

 

Disco I's its green antifreeze.
Disco II's its Dexcool.

This is from Land Rover.

 

And Disco 2's blow head gaskets every other thread.

 

As do D1's