
The Chinese government's investigation was triggered by allegations that fuel tankers were used to transport cooking oil after carrying toxic chemicals without being properly cleaned between loads, potentially causing food contamination. This issue has spread online, becoming a top trending topic on Chinese social media and raising concerns about food safety standards.

Social media users in China have expressed concerns about potential food contamination due to allegations that fuel tankers have been used to transport cooking oil without being cleaned properly after carrying toxic chemicals. The issue has spread online, becoming the top trending topic on Chinese social media and drawing comparisons to the 2008 Sanlu milk scandal. Users are demanding transparency and food safety, with many calling for strict action against the companies involved.

Transporting cooking oil in contaminated fuel trucks was said to have been so widespread that it was considered an "open secret" in the industry, according to one driver quoted by the Beijing News2. The practice reportedly involved several major Chinese companies, including a subsidiary of state-owned Sinograin and the Hopefull Grain and Oil Group.