Passage 9 Choi said most of the rest would be exported to the mainland and other neighbouring countries including Taiwan.But the label of used oil from Hong Kong could be altered in some countries which ban its imports,Choisaid He called for a licensing system on buyers of used oil. 414Passage 9 4 / 4 Choi said most of the rest would be exported to the mainland and other neighbouring countries including Taiwan. But the label of used oil from Hong Kong could be altered in some countries which ban its imports, Choi said. He called for a licensing system on buyers of used oil