* Chrysler 5-speed automatic (545RFE): This transmission typically uses ATF+4. This is a specific Chrysler fluid, and using anything else is strongly discouraged.
* NAG1 5-speed automatic: This less common transmission also uses a specific fluid, though details might vary slightly depending on the market and exact build date. It's crucial to check your owner's manual to determine the precise fluid specification for your specific NAG1 transmission.
Crucially, always consult your owner's manual. It will definitively state the correct transmission fluid type for your particular 2006 Chrysler 300. Using the wrong fluid can severely damage your transmission.