Do I need to replace my transmison that has black oil
Yes,it should be changed every 50,000 miles.
Tuff means the transmission fluid , not the transmission.
If the trans fluid is black that means that there is slippage during transmission operation and burning the fluid, try servicing the transmission, and drive it for about a hundred miles and service it again then watch the color of the fluid closely, if it changes color quickly then the trans will most likely need overhauled or replaced.
OOPS - exactly tom
Looking for a Used Equinox in your area?
CarGurus has 61,631 nationwide Equinox listings starting at $1,600.
Search Chevrolet Equinox Questions
Chevrolet Equinox Experts