China Marine Bunker (PetroChina) Co Ltd bought an 8,000-metric-ton cargo of low-sulfur fuel oil from Russia, according to a company official who asked not to be identified because the information is confidential.

The country's largest marine-fuel supplier, known as Chimbusco, paid a premium of about $110 a ton over Singapore prices, and the shipment arrived at North China's Tianjin port in mid July, the official said.