Walk down the cooking oil aisle, or scroll through a D2C website, and you will spot both "cold pressed" and "wood pressed" on labels, sometimes on the very same bottle. Are these two names for the same process, or is there a real difference between cold pressed and wood pressed oil that changes what ends up in your kitchen? The short answer is that wood pressed oil is a specific, traditional technique that falls under the broader cold pressed category, but the two terms are not interchangeable. Here is what actually separates them.
What Is Cold Pressed Oil?
Cold pressed oil is any oil extracted using mechanical pressure alone, without adding external heat or chemical solvents. Modern cold press units typically use steel expellers that crush oilseeds and let the oil flow out through friction pressure. Manufacturers keep the temperature below a defined threshold during this process, usually somewhere between 40 to 60 degrees Celsius, which is why an oil is only labelled "cold pressed" if it meets that heat limit, not just because a machine was involved.
What defines the process
- No external heating element is used during extraction
- No hexane or chemical solvents are added to pull out extra oil
- Temperature is monitored and kept low throughout pressing
- Filtration is mechanical, not chemical bleaching or deodorising
What Is Wood Pressed Oil?
Wood pressed oil, also called kolhu or chekku oil depending on the region, is extracted using a wooden mortar and pestle setup known as a ghani. Traditionally an ox turned the ghani in a slow circular motion; today most units use a small electric motor, but the wooden vessel and low rotation speed remain the defining feature. The wood absorbs and dissipates friction heat rather than conducting it the way steel does, and the churning speed is much slower than a steel expeller, often in the single digit to low double digit rotations per minute range.
Why the wood and the speed matter
Because the process is slower and generates less friction heat, wood pressed oil tends to retain more of the seed's natural aroma, colour, and heat sensitive compounds. The tradeoff is a lower extraction yield per kilogram of seed, which is one reason wood pressed oil usually costs more per litre than a standard steel expeller cold pressed oil.
Difference Between Cold Pressed and Wood Pressed Oil: The Key Points
- Equipment: cold pressed generally uses a steel expeller; wood pressed uses a wooden ghani
- Speed: steel expellers run considerably faster than a wood ghani, which turns very slowly
- Heat generated: both stay under the cold press temperature threshold, but wood pressing typically generates noticeably less friction heat
- Yield: wood pressing extracts less oil per kilogram of seed, which usually means a higher shelf price
- Flavour and aroma: wood pressed oil is often described as having a stronger, more traditional taste, since less heat means less loss of volatile aromatic compounds
In short, every wood pressed oil is a cold pressed oil, but not every cold pressed oil is wood pressed. The distinction comes down to the equipment and the speed of extraction, not two unrelated categories.
Which One Should You Choose?
Both methods sit on the less processed end of the spectrum compared with refined oil, which is typically extracted using heat and chemical solvents, then bleached and deodorised. If minimal processing is your priority and price is secondary, a wood pressed oil is worth seeking out. If you want the same mechanical, solvent free extraction at a more accessible price point, a well made cold pressed oil on a steel expeller is a sound everyday choice. Rulife's cold pressed oils, including mustard and coconut, are extracted mechanically without added heat or chemical solvents, and you can browse the current range at Rulife's oil collection.
FAQs
1. Is wood pressed oil the same as cold pressed oil?
Wood pressed oil is a type of cold pressed oil. All wood pressed oil qualifies as cold pressed, since it uses no external heat, but not all cold pressed oil is wood pressed, since most cold pressed oil today is made on steel expellers rather than wooden ghanis.
2. Which lasts longer on the shelf, cold pressed or wood pressed oil?
Refined oils generally have a longer shelf life because processing removes compounds that can turn rancid faster. Between cold pressed and wood pressed oil specifically, shelf life is fairly similar, usually a few months once opened, and depends more on storage in a cool, dark, airtight container than on the pressing method itself.
3. Why is wood pressed oil more expensive than regular cold pressed oil?
The slow speed and low yield of a wooden ghani mean it takes more raw seed and more time to produce the same quantity of oil compared with a steel expeller, and that lower output is passed on in the price.
4. Does wood pressed oil taste different from cold pressed oil?
Many people report a stronger, more pronounced flavour and aroma in wood pressed oil, since slower extraction preserves more volatile compounds. The difference is noticeable but can vary by seed type and by the specific mill.
5. Can I use cold pressed or wood pressed oil for high heat cooking?
Cold pressed oils, wood pressed or otherwise, generally have a lower smoke point than refined oils, so they suit light sauteing, tempering, and finishing dishes better than sustained deep frying at very high temperatures.
6. Is wood pressed oil always better for health than cold pressed oil?
Not necessarily. Both are minimally processed and free of added chemicals or heat. Wood pressing may preserve slightly more heat sensitive compounds due to its slower speed, but the difference between the two is smaller than the difference between either one and a refined, chemically extracted oil.
Conclusion
Cold pressed and wood pressed oil are close cousins, not opposites. Wood pressing is simply a slower, older technique that happens to meet the cold press definition while using traditional equipment. If you are comparing bottles on a shelf, the real question is not "cold pressed versus wood pressed" so much as "how was this oil actually extracted, and was any heat or solvent added along the way." Either option is a reasonable step up from a heavily refined oil, and the right pick often comes down to budget and the flavour you prefer in your cooking.
