BEIJING—China’s crude oil imports plunged in October to the lowest since September 2018, as large state-owned refiners withheld purchases because of rising prices while independent refiners were restrained by limited quotas to import. The world’s biggest crude oil importer brought in 37.8 million tons last month, data from the General Administration of Customs showed on Sunday, equivalent to 8.9 million barrels per day (bpd). That is down from 9.99 million bpd in September and 10.02 million bpd in the same period last year. Over the January–October period, crude arrivals totaled 425.06 million tons, or 10.21 million bpd, down 7.2 percent year-on-year, the customs data showed. Crude imports were down on a monthly basis for a second month and the decline has occurred amid a 62 percent jump in crude oil prices this year as economies open globally from COVID-19 pandemic restrictions, spurring fuel demand. Beijing’s crackdown on illicit trading in …