One important note is to not rely solely on the coolant color to indicate the type of chemistry (IAT, HOAT, OAT, NOAT) used in the coolant. Although TMC has established recommended colors for varying types of coolants in RP-35 not all manufacturers follow the color guidelines, according to Dilley. However, compared to OAT and NOAT coolant formulations, the IAT coolants do require the frequent addition of SCA at an interval of 20miles, or as specified by the engine manufacturer.
This is the best antifreeze and coolant for almost all types of Ford vehicles and perfect as a replacement formula for the classic coolants. However, the radiator and the storage tank must be totally flushed out so that this new formula won’t get mixed up with the old stuff which may cause issues. Coolant filtration is proven to reduce wear and optimize cooling system performance. This is especially important for coolants that stay in the engine longer.
The NOAT coolant , however, is still distinctly orange to red-orange. ES Compleat NOAT is available in the following packaging sizes. Few people who see it alone would describe it as red.
In some heavy duty diesel applications you may see a reference to a Coolant Extender. A Coolant Extender can be used with an OAT coolant to top-up certain additives at the products half life which is typically around 480kms.

