The gang members were fined and sentenced to jail terms for up to 15 years, while their smuggling vessels, two oil tankers, were confiscated, Nanjing Customs said, citing a statement from Yangzhou City Intermediate People's Court in Jiangsu Province.
In November last year, Yangzhou Customs staff found an oil tanker coded "Haiguanshan No.66" was illegally transporting refined oil products in ports along the Yangzhou section of the Yangtze River.
Further investigation showed another oil tanker was also involved.
Financial transactions were conducted via underground banks, state-run Xinhua news agency reported today.
The gang had smuggled more than 35,000 tonnes of oil products since 2013, customs staff said.
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