![]() ![]() Standard Specification for Glycol Base Engine Coolant for Automobile and Light-Duty Service. Aluminum Hot Surface Standard Test Method for Corrosion of Cast Aluminum Alloys in Engine Coolants Under Heat-Rejecting ConditionsĪSTM D-3306= Automotive service interval. What does that mean and is that all you need to know.ĪSTM D-4340 = Test for new coolant. When you see most coolants they will say that they pass the ASTM D-3306 and ASTM D-4340 standards. There is a difference between performance requirements and chemical requirements. Now that we know all that can’t we just poor any coolant into the car that says it meets all the requirements to be used in any car. OAT coolants reduce the effects of ECD because the OAT coolants conduct less ECD then the older coolants. ECD can be attributed as the cause of many premature coolant system failures. This electrical charge degrades both rubber and metal parts in the cooling system from the inside out. electrochemical degradation or ECD is where the motion of coolant and water through your engine creates an electrical charge similar to a galvanic battery. One of the things that older cars and coolant had issues with was the fact that older coolant wasn’t very helpful in preventing electrochemical degradation. So the new OAT is longer lasting safer and has some added protection that older coolants didn’t. The OAT coolant is much safer for children and pets. Now if you spill your G12 OAT coolant you don’t have to worry about killing your neighbor’s dog. It is made from a propylene glycol base which makes it less poisonous than the older coolant and being less toxic and poisonous it is much less harmful to the environment. This helps give it that extended life extended mile protection ability. Switching over to the new G12 or OAT style coolant has lots of advantages the OAT coolant has very similar corrosion protection as the older green coolant but its slower acting and is more stable resulting in it being slower acting and taking much longer to break down. G12= Organic Acid Technology or OAT for short. The OAT name is also seen when referred to as Dex-cool. Organic Acid Technology = propylene glycol. In comes Organic Acid Technology or OAT biased coolants for short. The big requirements of the coolant come down to the classification of them and how that changes things. The way Audi solved these issues for the bigger requirement was with a different blend of chemicals using a new classification. People wanted longer distances between needing to service oil and coolant. As the motors became more demanding the gaps between servicing the motor and the oil needed to change as well. This was not only bad for the motor it was bad for some of the motor components. Most of the time people would keep the coolant in way past its normal life. The older style of coolant (green stuff) had a shorter life then most people understood. As the years have moved on and the motors have become more and more complicated with higher requirements things needed to change. ![]() You can usually tell if the mix is too strong or too diluted by looking at the color consistency. There is also color added to help in recognition of leaks and to help in identification while helping give an idea on proper mixing. There are also other chemicals added to help in lubrication, corrosion inhibitors and others for buffers. To better understand why come coolants and mixes work and others don’t lets explain what coolant is and why getting the mix wrong can lead to damage.Īll coolants have chemicals added to help in pulling heat away from the motor to (cool ie coolant) cool the motor and there are chemicals added to assure the fluid won’t freeze (antifreeze)So this is why we call it coolant or antifreeze. But does that mean they will work and be ok in your car. What you will see often is them saying they meet or exceed the standards of the G12 coolant. You see lots of coolants saying that they are compatible but are they. Here are a couple suggestions that have been found to be in line with what G12 coolant seems to provide. They are recognized as a direct replacement for All Audis. If you can’t get to a dealer what choice you do you have? Look into Pentosin coolants. Below is more information on what and why.įirst off always try to use the fully recommended coolant G12 can be found at every Audi VW dealer. G12 replacement or Audi replacement coolant other then G12 is out there. Is there any suitable replacement for the OEM VW Audi G12? Yes there is. ![]()
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