No, you should
not use 15W-40 oil in a 2002 Chevy Malibu. 15W-40 is a heavy-duty oil typically used in diesel engines or gasoline engines requiring a thicker, higher viscosity oil under heavy loads or high temperatures. The 2002 Malibu's engine is designed for a much thinner oil, likely a 5W-30 or 10W-30, depending on the specific engine and climate. Using 15W-40 will likely cause increased engine wear, reduced fuel economy, and potentially damage the engine's oil pump.
Always consult your owner's manual for the recommended oil viscosity and specifications for your specific 2002 Chevy Malibu. The information sticker on the engine bay may also provide this information. Using the incorrect oil viscosity is a serious mistake that could significantly shorten the life of your engine.
