Silicate base antifreeze comes in different colour's. The green antifreeze is the cheapest antifreeze out there but there only good for 30,000 miles and need to be changed if not once a year for it's short life against corrosion to aluminum (Radiator) the orange colored antifreeze and Preston has this available in there line of antifreeze pre mixed 50/50 if your not sure how to mix them 50/50. Has a life expectancy of 5 years or 150,000 miles. Just make sure you keep it close as possible to 50/50 mix (50 antifreeze/ 50 water) If you have more antifreeze then water, it could gel up and cause over heating do to lack of coolant flow through the radiator. Good luck and hope this helps, a good thing to is to change the thermostat the same time you service the cooling system.
Go to prestone website and read contents. Siicate based is important.
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