However, generally speaking, Chrysler PT Cruisers often call for oils in the 5W-20, 5W-30, or 10W-30 viscosity range. Again, check your owner's manual. The manual will also specify the oil's API certification (like SM, SN, or SP) which indicates its quality and performance level. Using the wrong oil can damage your engine.
Don't rely solely on online advice – use your owner's manual as your primary source for this information.