YES. Like other vital automotive fluids, transmission fluid deteriorates over time. Just as motor oil is the lifeblood of the engine transmission fluid is the lifeblood of the transmission. The speed of the fluid deterioration will vary dependent on driving, hauling heavy loads, trailer towing. These types of driving raise the operating temperature of the transmission, and heat puts more strain on the transmission and the fluid, which helps facilitate gear shifts, cools the transmission and lubricates internal parts.
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