Imports In 2020, Montenegro imported $66 in Bituminous or oil shale and tar sands, becoming the 0th largest importer of Bituminous or oil shale and tar sands in the world. At the same year, Bituminous or oil shale and tar sands was the 0th most imported product in Montenegro. Montenegro imports Bituminous or oil shale and tar sands primarily from: N/A.