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The 2004 Toyota Sienna requires 4.5 quarts of 5w30 synthetic oil. It's advised to replace both the oil and oil filter every 7,500 miles or annually, whichever occurs first. Regular oil changes can enhance engine longevity, boost fuel efficiency, and improve performance by preventing particles and sludge buildup. Neglecting oil changes can lead to various engine issues over time, as old oil becomes thinner, abrasive, and can damage critical engine components. Synthetic oil is preferred for its superior performance, as it reduces friction and provides better engine protection.
The owner's manual for the 2004 Toyota Sienna states that the engine oil capacity is 4.5 quarts.