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In the 2011 GMC Terrain, you should use Dexron VI Transmission Fluid, which has a capacity of 9 quarts. Transmission fluid acts as a lubricant, protecting the transmission's components from heat damage. The cost for changing your Terrain's transmission fluid is typically $90 to $110 for labor and $60 for parts. It is recommended to change the transmission fluid every 45,000 miles. Signs that indicate you need a transmission fluid change include a grinding noise from the transmission, difficulty shifting gears, slipping during gear changes, sudden unpredictable accelerations, and a delay in movement after putting the vehicle in gear.
The amount of transmission fluid the 2011 GMC Terrain can hold is 6.3 quarts.
Is there any connection between a transmission leak and the radiator or coolant?
Fifty-five gallons