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Transmission fluid colors

Transmission fluid colors
Automatic transmission fluid is dyed bright red so mechanics can quickly identify leaks and distinguish it from engine oil or coolant. Modern transmissions use this same fluid for multiple jobs: lubricating gears, cooling components, and operating hydraulic clutches. Some newer vehicles use different colors like green or blue to indicate specific formulations. If the fluid turns brown or black, it signals oxidation and the need for replacement.
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