Since you don't have the owner's manual, you can try these resources:
* Online Owner's Manual: Search online for "2001 Chevy Malibu owner's manual PDF." Many websites offer free downloads of these manuals. Be sure you're downloading one for the correct engine size. The engine size should be printed on the engine itself, and often in a sticker in the driver's door jamb.
* Chevy Dealership: A local Chevrolet dealership service department can likely tell you the correct oil type for your Malibu's engine if you provide the Vehicle Identification Number (VIN). The VIN is located on the driver's side dashboard, typically visible through the windshield.
* Oil Change Shop: Most quick lube places will know the correct oil for your car based on the year, make, and model, and possibly the engine size.
Never just guess the oil type. Using the wrong oil can damage your engine. Take the time to find the correct specification to ensure your car's longevity.