Because the newly found products were not on the recall list, contamination may be broader than known. Authorities are tracing distribution channels and revising the recall's scope.

Lawmakers pressed on the gap between first notification and public disclosure, and on testing loopholes. The minister pledged expanded testing and a disclosure timetable.

Retailers and restaurants are scrambling for substitute oils, household return inquiries have surged, and related food stocks have turned volatile.

Experts say the episode underscores full-chain traceability from imported feedstock to shelves, arguing that routine testing capacity matters more than heavier penalties.

A prolonged scandal risks spreading distrust to school lunches and night markets, putting the government's speed and transparency to the test.