What Does Gray Transmission Fluid Mean?

Your transmission fluid is constantly hard at work. Over time, the parts in your transmission wear down and “shed” metal into your transmission fluid. This turns the fluid from a clear bright red color to gray, brown or even black.

What color is transmission fluid when its bad?

The reason why transmission fluid changes from bright red to brown to black as it ages is that is it oxidizing. Oxidation is bad for transmission fluid. Dark brown or black transmission fluid is dirty and incapable of lubricating the hundreds of transmission parts. It will cause damage if you don't have it changed.

Does transmission fluid color matter?

Healthy transmission fluid should be relatively clear or pink in color. If your transmission fluid is deep red or brown, your transmission fluid is old and most likely causing extra damage within your transmission. If it is dark brown, that is a sign you have burnt transmission fluid from overheating.