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The recommended differential fluid for the 2008 Ford F-150 is the Dex/Merc Conventional Automatic Transmission Fluid. This fluid plays a crucial role in lubricating the gears, bearings, and internal parts of the differential, while also providing necessary cooling. Over time, the differential gear oil will lose its effectiveness, which can result in damage to the differential assembly. If your oil is no longer lubricating properly, it's important to have it replaced. To prevent extensive damage to the rear differential, aim to change the fluid every 30,000 to 60,000 miles. You can purchase this fluid at various locations including your local Autozone, other auto parts stores, as well as stores like Target and Walmart.
The type of rear differential fluid required for the 2008 Ford F150 is conventional automatic transmission fluid, specifically dex/merc ATF.