Geocachers924ExplorerJul 05, 2015DEF tankNew owner of a 2016 Navion 24G and was wondering if this RV has a DEF tank and how often it needs to be filled and where the input tube is located on the vehicle? Thanks. Terry
Old-BiscuitExplorer IIIJul 05, 2015Diesel engine..YES it uses DEFLook under the hood for filler tube.In mean time...get out your new owners manual and READ it. LOTS of really good information.