* Check your owner's manual: This is the most reliable source. The manual will specify the correct oil filter part number.
* Look up your vehicle's information online: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to enter your vehicle's year, make, and model to find compatible oil filters.
* Check the existing filter: If you have an old filter, the part number will be printed on it.
Simply searching for "Chrysler 300M oil filter" online without specifying the year will give you many results, but some may not be correct for your specific car. Always confirm the fitment before purchasing.