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Each 2003 Chevrolet Malibu comes equipped with the same 3.1 liter V6 engine, meaning regardless of your trim level, you will require 4.5 quarts of SAE 5W-30 full synthetic motor oil. While in warmer regions, it is possible to opt for SAE 10W-30 or SAE 5W-40 full synthetic motor oil, it is not advisable unless absolutely necessary. Choosing heavier oils can result in increased friction within the engine, leading to premature wear and potential early engine failure. It is best to adhere to the manufacturer's recommendation of using the lighter weight oil, even if it may cost a bit more initially, as it will prove cost-effective in the long run.
The 2003 Chevy Malibu with a 3.1L V6 engine requires 4.5 quarts of 5W30 synthetic oil for proper lubrication.