In sealed packs kept cool and out of light, groundnut and sesame oil usually carry a best-before of roughly 6 to 12 months for filtered or cold-pressed oil. Refined oil is often given around a year, sometimes longer.
These are typical declared figures, not fixed rules. The real shelf life depends on the starting quality of the oil, the pack and how it is stored. Ask your supplier for the shelf life they have actually tested.
Why oil goes off
The main enemy is oxidation. Oxygen reacts with unsaturated fatty acids and, over time, gives the stale, painty smell of rancid oil. Heat, light and traces of metals such as copper and iron speed this up.
The second problem is hydrolysis. Water in the oil splits fats into free fatty acids, which raises acidity and gives a soapy or sharp taste. Unrefined oil with suspended solids and moisture is more prone to this.
Groundnut and sesame behave differently
- Groundnut oil is fairly stable for a liquid oil, thanks to a high share of oleic acid. Filtered groundnut oil still loses its fresh aroma within months if stored warm.
- Sesame oil is known for good stability. It contains natural antioxidants such as sesamol and related compounds, which slow rancidity.
- Cold-pressed versions of both keep more flavour but also more moisture and fine solids, so they are usually given a shorter best-before.
- Toasted sesame oil, a different product from most Indian gingelly oil, has its own flavour profile and storage behaviour.
What extends shelf life
- Fresh, sound seed and quick processing, so the oil starts with low FFA and peroxide value.
- Good filtration and low moisture before filling.
- Opaque or tinted packs, or tins, to keep out light.
- Nitrogen flushing of the headspace in bottles and tins.
- Full packs with little air, tightly sealed.
- Cool, dry storage away from direct sun, both in India and at destination.
- No contact with copper or brass fittings during filling.
How to check shelf life claims
Ask for peroxide value and FFA at production and again at intervals on retained samples. Some labs also run an accelerated oxidation test, such as a Rancimat measurement, to compare oils. This is useful for comparing suppliers, but it does not replace real-time data.
Test on arrival too. A container that sat in the sun at port can age oil faster than the label suggests. Pack choice matters a lot, as explained in how edible oil is packed for export. The test list is in tests for an edible oil certificate of analysis.
Your label must state the date format your market requires. Shelf life you print is your responsibility as importer, so base it on evidence, not the supplier's habit.
How we help
We collect the supplier's retained sample data, have peroxide value and FFA tested at an NABL-accredited lab, and check filling, sealing and storage at the plant. That gives you a defensible basis for your best-before date. Ask for a free sourcing review.