What visual characteristic indicates that an ATF is new?

The indication that automatic transmission fluid (ATF) is new typically manifests as a pink color. This pink hue comes from the dyeing of the base oil used in the formulation and signals that the fluid is fresh, clean, and has not been contaminated or degraded through use. New ATF is essential for optimal transmission function, providing necessary lubrication and facilitating proper shifting.

In contrast, older ATF tends to change in appearance due to factors such as heat, friction, and the presence of metal particles or burnt components. Over time, the fluid can darken, turning brown or black, which suggests that it has been degraded and may have lost some of its effectiveness in protecting the transmission. Therefore, the presence of a vibrant pink color is a clear visual cue for mechanics and vehicle owners alike, indicating that the ATF is still in good condition and fit for use.