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For optimal performance, it is recommended to utilize Honda Dual Pump Fluid II in the rear differentials of Honda CR-Vs equipped with 4WD or AWD systems. Most manufacturers suggest having the differential fluids replaced every 30,000-60,000 miles to maintain the function of the differential and reduce friction between moving components, particularly the ring and pinion gears that transmit power from the driveshaft to the wheels' axles. Indications that a differential flush may be needed include grinding noises when turning, humming sounds from the gears, and vibrations while driving. The cost of a rear differential oil change typically ranges from $80 to $150, covering the replacement fluids and some labor.
The recommended fluid for the rear differential of a Honda CR-V is 80W oil, with full synthetic being the ideal choice for optimal performance.