![]() This coolant is used in more modern vehicles and is designed to last longer than IAT coolants. Organic Acid Technology coolant will only need replacing every five years, this is approximately once every 50,000 miles. If your car uses this coolant, it will need to be changed once every 2 years (around every 24,000 miles). This coolant has fallen out of favor in recent years but is still the coolant of choice for vehicles manufactured in the 20th century. This coolant is typically a blue or green color and is most commonly used in older vehicles. IAT antifreeze uses ingredients such as propylene glycol or ethylene glycol. The three types of engine coolant used: Inorganic Additive Technology ![]() ![]() While it would make life easier if all engine coolants were the same, unfortunately, this is not the case. In fact, there are three different coolants used by car manufacturers and there can be big consequences if you use the wrong product in your car. In this article, we will be looking closely at the different coolant products and what the different colors mean. If you want to know why you can’t mix green and orange coolant, keep on reading to find out the answer. Drivers should not mix green and orange coolant, as they’re made of different chemical components and can cause the antifreeze to turn into sludge or cause serious damage to the radiator, water pump, and engine block. So you may be wondering is mixing green and orange coolant safe?Įngine coolant is available in different colors and different products use varying chemicals. Coolant helps to prevent the car engine from overheating and it will not freeze, even in winter. So keep that in mind.Coolant, also known as antifreeze, is essential for the proper functioning of your car’s engine. One more note to add, I think if you have both types mixed in a cooling system the corrosion inhibitors attack eachother shorting the life of the coolant much sooner than 2 years. So if you in a bind or you dont want to buy dexcool try those out. GM only mentions Havoline as having a coolant compatible with dexcool. Prestone and Havoline both make coolants that are compatible with dexcool but arent exactly dexcool. Avoid putting anything in the system containing those 2 things. If you cant find GM dexcool the best alternatives are silicon phosphate free coolants. Keep in mind that just because a cooling system says 5 years 150k miles doesnt mean you can ignore checking the system that long! Check it weekly and monitor for any coolant loss and if there is any find where its going and fix it. Those 4 things I found seem to help out a lot. KEEP air out of your system, Keep your radiator cap clean, Keep your overflow bottle filled to the highest mark, and use only distilled water with 50/50 mixes. Now as for dexcool sludge/foam/mud, the best cure for that seems to be this. That coating "prevents" dexcool corrosion inhibitors from effectively lasting more than 2 years. I can look at a system that has had green coolant in it and it is coated with scaling even from short term use. Even if you try to switch back to dexcool. (my theory) When ever you put a silicon based coolant in your cooling system you must and I mean MUST change your coolant every 2 years. The aluminum pipes on heater cores seem to often fail because of this. As the coolant ages the silicon tends to bond to each other forming larger particals and it begins to eat away at aluminum like a sand blaster. The silicon contained in green coolant isnt the healthiest stuff you can put in a modern cooling system. I've also seen hardened clusters of silicon bonded to aluminum surfaces. I've seen some pretty bad pitting on machined mating surfaces of aluminum. From what "I've experienced" and have seen the conventional green coolant attacts aluminum towards the end of its life cycle vigorously.
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