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Differential oil plays a critical role in lubricating the driveshaft and wheel axles of a vehicle. The 2011 Ford F-150, being a heavy truck, requires a gear oil with a viscosity of 75W-140. Located beneath the truck amidst the driveshaft, the differential casing is fastened with 15/16" bolts, and the plug can be loosened with a 3/8" drive. It's important to inspect the plug for any metal shavings that may have come from the gears, as it is equipped with a magnet. A clean plug indicates that the gears are not excessively worn. It is recommended to have the gear oil changed every 30,000-60,000 miles for the F-150, with an average cost of $165-$215 covering parts and professional labor.
In the 2011 Ford F-150, you need to use 75/140 synthetic oil in the rear and 80/90 GL5 in the front.