Food safety
Do not revive degraded frying oil with fresh oil
Stop using degraded oil instead of mixing in new oil. Turn off the heat, let it cool safely and follow the household's waste-oil disposal arrangement.
Last reviewed: 2026-09-20
Why it matters
Oil that has degraded cannot be restored by topping it up with fresh oil.
Wrong action
Adding fresh oil to hide persistent foam, unusual smoke or an off smell.
Correct action
Stop using degraded oil instead of mixing in new oil.
What to do
- Watch frying oil for signs of deterioration during use.
- Stop using degraded oil instead of mixing in new oil.
- Turn off the heat, let it cool safely and follow the household's waste-oil disposal arrangement.
If something happens
If someone becomes ill after eating, stop serving, keep food details and seek medical care. Call 999 for breathing difficulty, seizures or unconsciousness; do not induce vomiting.
Sources and review
- Food and Environmental Hygiene Department — FEHD: food hygiene code, frying oil
Last reviewed: 2026-09-20
This page provides general home-safety information and does not replace medical, legal, electrical, or other professional advice.