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The 2003 Ford F-150 comes with different engines such as the 4.2 liter 6-cylinder, the 4.6 liter V6, and the 5.4 liter V8. All these engines are recommended to be filled with 6 US quarts of 5W-20 oil along with a filter. It is advised to change the oil and filter every 7,500-10,000 miles or 12 months if using synthetic oil, and every 3,000-5,000 miles or 6 months with conventional oil. Opting for synthetic oil offers benefits like improved lubrication, longer service intervals, and better performance in extreme weather conditions. Additionally, synthetic oil with thinner viscosity flows more smoothly in cold temperatures, ensuring proper engine protection against friction and corrosion.
I suggest going with 5w30 over 5w20, but either option will be suitable.
All the engine choices available for the 2003 Ford F-150, including the 4.2L V6, the two variants of the 4.6L V8 (engine codes 6 and W), and the four versions of the 5.4L V8 (engine codes 3, L, M, and Z), require 6 quarts of 5W20 synthetic oil.
I am not sure.