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How Often Should You Replace Transmission Fluid on a Diesel Truck?

A mechanic opening the hood of a large semi-truck and preparing for a truck engine rebuild

Coolant, motor oil, brake fluid, gear fluid, hydraulic fluid, and transmission fluid: these are just a small sample of the many fluids that keep trucks running. While most motor oil requires a change every few thousand miles, transmission fluid change intervals aren’t always as clear. How often should you replace transmission fluid, anyway? The answer […]