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In the USA, for the 2006 Ford F-150, the recommended oil type and capacity are 5w20 and 6 quarts. It's important to change your oil regularly, ideally every 5,000 to 10,000 miles. Neglecting this maintenance can lead to engine problems. Using high-quality oil is crucial for the engine's performance. Eventually, issues with the oil may arise, such as a strong burning odor. If this occurs, it's critical to have your vehicle inspected promptly to prevent potential dangers like engine failure or even an explosion. Poor-quality oil can cause the engine to malfunction, resulting in reduced gas mileage and potential knocking noises.
In 2006, all engine choices for the Ford F-150 require 5W20 synthetic oil. The 2006 F-150 offers these engine options: a 4.2L V6 (6 quarts of oil), a 4.6L V8 (6 quarts), a non-flex fuel 5.4L V8 (7 quarts), and a flex fuel-capable 5.4L V8 (7 quarts).
In 2006, a Ford F-150 with a 5.4-liter V8 engine requires 7 quarts of synthetic oil.
I stick with using 5w-30 FULL synthetic Pennzoil Ultra in my vehicle, along with adding 4-8 ounces of Bestline or Prolong. With 160,000 miles on the odometer, I haven't experienced any issues or leaks yet. My mechanic mentioned that the engine remains very clean after changing the valve cover gasket and performing oil changes every 3-5k miles. Notably, even replacing the spark plugs was a breeze and none broke, which is a known issue for 2004-2007 F-150 trucks.