The engine air filter element in the Pentastar 3.6L V6 motor of a revised fifth generation (2011, 2012, 2013 & 2014) Dodge Grand Caravan should be cleaned at every oil change and replaced when dirty. Take a look at my DIY tutorial for the procedure, including replacement part numbers, by clicking on the text link or thumbnail image below.
Dodge Grand Caravan Engine Air Filter Replacement Guide
