Rudolfo,<P> Check and make sure the Prestone is not premixed. Yes that is antifreeze. If it is premixed (it should say on the front of the jug) and your existing coolant is water you will dilute it further. If you can get an antifreeze tester you can measure the amount of coolant in your system. It looks like a teardrop shaped plastic syphon with a hose on one end and a bulb on the other. A 50% water/ 50% prestone mix will be ok if that is the easiest for you. I would go with the 60%water/40% antifreeze mix as it doesn't get too cold down there. Also make sure you have a clean rad outside when you are travelling in the desert. A rad full of silt will not work as well as a clean rad. We used air pressure to blow off the dust. Make sure if you do this it is done by holding the air nossle to the side as it can force silt into your rad.