Gas that comes off the oil later is condensed into paraffin. Last of all the lubricating oils of various grades are produced. What remains is heavy oil that is used as fuel.

• 稍后从油中分离出来的气体就被冷凝成煤油，最后制出的各种不同等级的润滑油。而剩下的部分是用作燃料的重油。