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What oil to use in a 2003 Ford Mustang 4.6L?

The 2003 Ford Mustang 4.6L engine recommends using 5W-20 motor oil. However, you should always check your owner's manual for the most definitive recommendation, as it might specify a different viscosity depending on your climate and driving conditions. Using the incorrect viscosity can negatively impact your engine's performance and longevity.