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In the owner's manual for the 2003 Toyota Avalon, it indicates that the recommended oil code is SAE 5w-30. The engine requires 6.4 quarts or 6.1 liters of oil, which is the suggested amount for refilling during service. Ensure you choose the correct type of oil for the engine and look for the API Approval seal to verify that the oil is suitable for use in Subaru vehicles. When doing an oil change, you have the option of using conventional or synthetic oil. Keep in mind that synthetic oils are more effective and last longer than conventional oils, which may require more frequent replacement.
The oil that is suggested for use in the 2003 Toyota Avalon is SAE 5W-30 synthetic motor oil.