Many automatic transmission fluids are red when new, but other colors are used. The expected appearance depends on the specified fluid, so color alone cannot confirm that the correct product is installed.
Fluid can darken with use. Odor, contamination, service history, and transmission operation provide additional information. A milky appearance or visible debris warrants further investigation.
Certified Transmission at 1303 Fort Crook Rd. N. in Bellevue can evaluate fluid concerns using the appropriate procedure. Neither bright fluid nor dark fluid, by itself, establishes the internal condition of a transmission.