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What is the recommended oil weight for a 2003 expedition with 5.4 liter engine?

The recommended oil weight for a 2003 Ford Expedition with a 5.4L engine depends on the climate. Ford typically recommends 5W-20 for most conditions. However, if you live in an area with extremely cold winters, you might consider 5W-30.

Always check your owner's manual. It's the definitive source for the manufacturer's recommended oil weight and specifications for your specific vehicle. The information printed inside trumps anything found online. The manual will likely specify the correct oil viscosity grade based on temperature.