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The 2003 Ford Explorer with a 4.0 liter V6 engine requires 5 US quarts of 5W-30 motor oil, while the 4.6 liter V8 model needs 6 US quarts of the same oil. It is recommended to change the oil and filter every 7,500-10,000 miles or 12 months if using fully synthetic oil, or every 3,000-5,000 miles or 6 months with conventional oil. Synthetic oil offers benefits such as improved lubrication, longer service intervals, and better performance in extreme weather. Thinner-viscosity oil flows better in cold temperatures, protecting engine parts from friction and corrosion. A typical oil change for the Ford Explorer costs between $110-$123 for parts and labor.
The 2003 Ford Explorer comes with two types of 4.0L V6 engines - the SOHC and Flex versions - that both need 5 quarts of 5W30 synthetic oil. If you opt for the 4.6L V8 engine in the 2003 Explorer, it will require 6 quarts of 5W20 synthetic oil.
Use 5w20 for colder areas and 5w30 for hotter regions.
It's actually 5 quarts of 5w20, not 5w30, for the model years 2002 through 2010.