潍柴动力：全资子公司山东欧润油品有限公司可销售润滑油，本年度销量同比实现小幅增长

Group 1 - The company has a subsidiary, Shandong Ourun Oil Products Co., Ltd., that sells lubricating oil [2] - The sales volume of lubricating oil for the current year has seen a slight increase compared to the previous year [2]