Can red and blue antifreeze be mixed?

[OBrantley]

Red and blue automotive antifreeze cannot be mixed. Different colors of antifreeze may have variations in chemical properties and compositions. Even if the main components are the same, the secondary ingredients and formulation ratios can differ. Mixing them may trigger chemical reactions, leading to hazards such as sedimentation, scaling, and corrosion, which can affect the engine's lifespan. How to choose antifreeze: The basic indicators of antifreeze are its freezing point and boiling point. Market-available antifreeze comes in specifications like -15°C, -25°C, -30°C, and -40°C freezing points. Generally, it's advisable to choose one with a freezing point at least 10°C lower than the lowest temperature in your region. How to check if antifreeze is low: Observe the antifreeze warning light on the dashboard. If it lights up, it likely indicates low antifreeze levels, though it could also be due to excessively high cylinder temperatures. Inspect the antifreeze reservoir. If the fluid level is below the minimum mark (MIN), do not continue driving and promptly add antifreeze. Check the water level markings on the antifreeze tank. The normal antifreeze level should be between the maximum and minimum marks. If it falls below the minimum mark, it indicates a shortage of antifreeze.