However, generally speaking, for a 2001 PT Cruiser, 5W-30 is a common and often recommended weight. If you live in a very cold climate, a 0W-30 might be preferable for easier cold-weather starting. If you live in a very hot climate, a 10W-30 might be considered, but 5W-30 is usually a good all-around choice.
Always check your owner's manual for the manufacturer's specific recommendation. Using the incorrect weight oil can damage your engine.