What type of motor oil do you put in a 2003 Pontiac sunfire?

The recommended motor oil for a 2003 Pontiac Sunfire depends on the engine it has. The Sunfire came with a few different engines. You must check your owner's manual to be certain.

However, generally speaking, a 2003 Sunfire would likely use conventional or synthetic blend 5W-30 motor oil. The owner's manual will specify the exact viscosity (like 5W-30, 10W-30, etc.) and whether it recommends conventional, synthetic blend, or full synthetic oil. Using the incorrect viscosity can damage your engine.