Red: Transmission fluid is always red when brand new but will turn light brown as it ages.
Dark brown or black: Dark brown or black fluid has experienced significant breakdown.
Pink: A pink color means the fluid has become contaminated with coolant or other fluid.
If your fluid is dark brown or pink, you need to change it right away. However, in addition to the color, look for metal shavings inside your fluid. If you notice metal shavings, contact us at Key Transmission and Gears for an inspection.