* 2.4L four-cylinder: This was a common base engine.
* 2.7L V6: A more powerful option.
* 3.6L V6 (Pentastar): A later and more powerful V6 option.
To know the exact engine in a *specific* Dodge Avenger, you'd need to check the vehicle's documentation (owner's manual, vehicle identification number (VIN) report) or the sticker in the engine compartment.