Usually you can find it stamped or written either on the engine valve cover, on a sticker somewhere on the hood or front clip near the radiator, on the sticker on the driver side door near the latch mechanism, or sometimes on your insurance or registration papers. If all else fails, write down the Vehicle Identification Number (VIN) found on the driver side dash near the windshield (or on your insurance or registration papers) and ask your Dodge dealer. They will be able to tell from the number. Or if you show them the engine they will be able to tell you.
The 2002 Dodge Grand-Caravan has a V6 engine.
The 2004 Dodge Grand-Caravan has a V6 engine.
The 2012 Dodge Grand-Caravan has a V6 engine.
The 2008 Dodge Grand-Caravan has a V6 engine.
The 2010 Dodge Grand-Caravan has a V6 engine.
The 2005 Dodge Grand-Caravan has a V6 engine.
The 2007 Dodge Grand-Caravan has a V6 engine.
The 2014 Dodge Grand-Caravan has a V6 engine.
The 2009 Dodge Grand-Caravan has a V6 engine.
The 2011 Dodge Grand-Caravan has a V6 engine.
The 2001 Dodge Grand-Caravan has a V6 engine.
The 2013 Dodge Grand-Caravan has a V6 engine.