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The Ford Expedition manufactured in 2003 has a coolant capacity of 21 quarts. It is recommended to replace the air filter every 15,000 to 30,000 miles. The coolant should be changed at the 60,000-mile mark, while spark plugs should be replaced at either the 100,000-mile interval, unless using a copper spark plug, in which case it should be replaced every 30,000 miles. Engine issues are common, including oil leaks that should be addressed promptly, loose gaskets that need tightening, and spark plugs that may come loose causing problems. Excessive oil consumption may necessitate more frequent oil changes. The most serious problem to watch out for is engine overheating, which can lead to fires and potential explosions.
In 2003, the Ford Expedition can hold up to 5.4 gallons of coolant.