It is very rare for a transmission fluid to not be red. Your transmission fluid should be changed every two to three years, or 24,000 to 36,000 miles. Amsoil Synthetic Cvt Fluid Is Durable In Normal And Severe Service It Effectively Resists Wear To The Transmissions Vital Amsoil Fluid Design Synthetic Oil And color of the sticker does not necessarily indicate fluid type. Transmission fluid color green . It is typically coloured red or green to distinguish it from motor oil and other fluids in the vehicle. If your leak is green, yellow or pink. However, rust plus antifreeze will be thin and can leak from various locations of a vehicle (not just the center). 5 common color stages of transmission fluid. The color of your transmission fluid is one of the best early warning signs of transmission problems, so it is important to check your own fluid or have it checked as part of your regular vehicle maintenance program. Previous answer explain it very well. By the defini...