Chrysler PT Cruisers don't use a specific *brand* of spark plug, but rather a specific *type* and sometimes a specific *heat range*. The recommended spark plug will vary slightly depending on the year and engine of the PT Cruiser. You need to check your owner's manual for the precise specification.
However, many brands manufacture spark plugs that meet those specifications. Brands like Champion, NGK, and Bosch are commonly used and readily available as replacements for PT Cruisers. You'll find their equivalents to the Chrysler-specified plug at most auto parts stores.
