Cold-Pressed vs Refined Oil: What Is the Difference?
Walk down the oil aisle and you will see bottles labelled refined, filtered, cold-pressed and wood-pressed. They are not the same product. This guide explains the real differences so you can pick the right oil for each job in your kitchen.
How refined oil is made
Most commercial refined oils are extracted from seeds with high heat and often a chemical solvent. The crude oil is then bleached, deodorised and filtered so it looks clear, smells neutral and lasts a long time on the shelf. The process removes strong flavours and colour, along with some natural compounds that came with the seed.
How cold-pressed oil is made
Cold-pressed oil is crushed mechanically at a low temperature, and the oil is then settled and filtered. There is no solvent and no bleaching or deodorising step. Wood-pressed (marachekku) oil is cold-pressed oil made in a wooden press, the traditional way.
Side by side
| Cold-pressed (unrefined) | Refined | |
|---|---|---|
| Extraction | Slow mechanical pressing, low temperature | Heat and often solvents |
| Processing | Settled and filtered | Bleached, deodorised, filtered |
| Aroma and taste | Natural aroma of the seed | Neutral, little aroma |
| Appearance | Golden to amber, can look slightly cloudy | Pale, very clear |
| Shelf life | Shorter, store with care | Longer |
| Best for | Everyday Indian cooking, tempering, pickles | High-heat, neutral-flavour cooking |
Which one should you choose?
If you like the aroma of traditional South Indian food, cold-pressed oil is the natural choice for daily cooking, tempering and pickles. If you need a completely neutral taste, for example for some baking, refined oil is common. Many households keep one of each, or use cold-pressed oil for most meals.
- Use cold-pressed groundnut oil for sauteing, poriyal and frying.
- Use cold-pressed sesame oil for podi, pickles and finishing.
- Use cold-pressed coconut oil for Kerala-style dishes and hair care.
A note on heat
Unrefined oils generally begin to smoke at a lower temperature than refined oils, so do not heat them until they smoke. Normal Indian cooking, sauteing and shallow frying are well within range. Whatever oil you use, avoid reusing it many times.