You might never see them (inside block, in other parts of the radiator, etc) but to be as safe as possible use distilled. They have quick-acting silicate and phosphate corrosion inhibitors that do a good job of. The original glycol-based green antifreeze we are all familiar with. The three basic divisions include the following: Group 1. A blue coolant may have the same formula as a red coolant. If a cooling system is being refilled with a universal coolant, the cooling system should be. Antifreeze is formulated using ethylene glycol or propylene glycol.Engine coolant can be a mixture of water with glycols or just water.Antifreeze is usually green, red, or yellow, whereas an engine coolant can be colorless or of a similar color as the antifreeze added to it. Indeed, yellow coolants may have very different compositions. They are formulated to meet the specific requirements of different engine generations and contain proprietary. If a universal coolant is added to an older vehicle that has traditional green antifreeze in the cooling system, the service intervals are also the same as before: two to three years or 30,000 to 50,000 miles. In addition, using tap water can eventaully leave deposits inside the cooling system. Do not mix yellow (VCS) and green coolants. What this means is that unless you've properly grounded your heater core and radiator, you'll get more electrolysis with the tap water than if you used distilled. I know a few ppl will say "I've used tap water for the past XYZ years, etc" but from an engineering perspective, the minerals and other stuff in tap water CAN help conduct electricity. Red antifreeze is a combination of inorganic acid technology (IAT) and organic acid technology (OAT), while green antifreeze is produced from IAT. Never use tap water unless you can verify that the water is both filtered, softened, and free of minerals. Coolant does raises the boiling point of the cooling system in summer, lowers the freezing point in winter, and protects the engine and cooling system from corrosion. Key Takeaways: Dexcool® red antifreeze lasts longer and is more stable compared to green antifreeze. But if you have friends that work in a chem lab, they distill the water themselves (GOOD STUFF). Its a bit more expensive than spring water, namely because of the distillation process of removing stuff from the water. ![]() I buy distilled water from my local super market or grocery store. Do not use tap water - tap water contains minerals and crap that contribute to electrolysis and can eventually eat away at your heater core and radiator.
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