Why Your Choice of Oil Matters
Cooking oil is not a one-size-fits-all ingredient. Different oils behave differently when heated, carry distinct flavours, and offer varying nutritional profiles. Using the wrong oil for the job can ruin the taste of a dish, fill your kitchen with smoke, or waste a premium product on a task that does not benefit from it.
Understanding which oil to reach for and when is a small piece of knowledge that makes a surprisingly large difference in everyday cooking.
What Is a Smoke Point?
Every oil has a smoke point: the temperature at which it begins to break down, produce visible smoke, and develop bitter, acrid flavours. Cooking beyond an oil's smoke point also generates harmful compounds. As a general rule, use oils with high smoke points for frying and roasting, and save oils with lower smoke points for dressings, finishing, and gentle cooking.
A Guide to Common Cooking Oils
Extra Virgin Olive Oil
Smoke point: approximately 190 degrees Celsius
Extra virgin olive oil is cold-pressed from olives without chemical processing, which preserves its flavour and nutritional value. It has a fruity, sometimes peppery taste that varies depending on the variety and origin.
Best uses: salad dressings, drizzling over finished dishes, dipping bread, low to medium heat sauteing, and roasting at moderate temperatures.
Health profile: rich in monounsaturated fats and polyphenols, which are associated with heart health and anti-inflammatory benefits. It is one of the most extensively studied oils in nutrition research.
Tip: despite common advice, extra virgin olive oil is more stable at moderate cooking temperatures than many people assume. It performs well for everyday sauteing. Save the expensive single-estate bottles for finishing and use a standard extra virgin for cooking.
Light or Regular Olive Oil
Smoke point: approximately 240 degrees Celsius
This is refined olive oil with a neutral flavour and higher smoke point than extra virgin. Do not confuse "light" with lower calorie; it refers to the lighter colour and taste.
Best uses: high-heat frying, roasting at high temperatures, and anywhere you want olive oil's cooking properties without its distinctive flavour.
Avocado Oil
Smoke point: approximately 270 degrees Celsius
Avocado oil has one of the highest smoke points of any cooking oil, making it exceptionally versatile. It has a mild, slightly buttery flavour that does not overpower food.
Best uses: high-heat searing, grilling, roasting, stir-frying, and as a neutral-tasting base for dressings and mayonnaise.
Health profile: high in monounsaturated fats, similar to olive oil. It also contains lutein, which supports eye health. Its neutral flavour and high smoke point make it an excellent all-purpose oil.
Tip: avocado oil tends to be more expensive than other options. If budget is a concern, reserve it for tasks where its high smoke point is genuinely needed, such as searing steaks or high-temperature roasting.
Coconut Oil
Smoke point: approximately 175 degrees Celsius (virgin) or 230 degrees Celsius (refined)
Coconut oil is solid at room temperature and has a distinctive tropical flavour in its virgin form. Refined coconut oil has a more neutral taste and a higher smoke point.
Best uses: virgin coconut oil works beautifully in curries, Southeast Asian dishes, baking, and anywhere its flavour complements the recipe. Refined coconut oil is suitable for medium to high heat cooking without the coconut taste.
Health profile: coconut oil is high in saturated fat, which has been a subject of debate. Current evidence suggests using it in moderation as part of a varied diet rather than as your primary cooking fat.
Tip: when baking, coconut oil can replace butter in many recipes at a one-to-one ratio. Melt it first and use it in place of melted butter for dairy-free baking.
Sesame Oil
Smoke point: approximately 210 degrees Celsius (light) or 175 degrees Celsius (toasted)
Sesame oil comes in two distinct forms. Light sesame oil has a subtle, nutty flavour and is suitable for cooking. Toasted sesame oil has a deep, intense flavour and is used as a finishing oil.
Best uses: light sesame oil for stir-frying and as a cooking oil in Asian cuisine. Toasted sesame oil for adding depth to dressings, marinades, noodle dishes, and soups. A few drops of toasted sesame oil can transform a simple bowl of rice.
Health profile: a good source of both monounsaturated and polyunsaturated fats, with antioxidant properties from sesamol and sesaminol.
Tip: toasted sesame oil is potent. Start with half a teaspoon and taste before adding more. Too much can overwhelm a dish.
Vegetable and Sunflower Oil
Smoke point: approximately 230 degrees Celsius
These neutral, affordable oils are the workhorses of high-heat cooking. Vegetable oil is typically a blend of soybean, rapeseed, and other oils. Sunflower oil is pressed from sunflower seeds and has a similarly clean, neutral taste.
Best uses: deep frying, shallow frying, roasting at high temperatures, and any application where you want the oil to contribute cooking function without flavour.
Health profile: both contain polyunsaturated fats. Look for high-oleic versions of sunflower oil, which have a higher proportion of monounsaturated fats and are considered a healthier option for regular use.
Tip: these oils are economical for deep frying, where you need a large volume and a high smoke point. Strain and store used oil in a sealed container in a cool, dark place; it can often be reused two or three times.
Rapeseed Oil (Canola)
Smoke point: approximately 230 degrees Celsius
Cold-pressed rapeseed oil has a golden colour and a gently nutty, slightly earthy flavour. Refined rapeseed (commonly labelled as canola oil) is neutral-tasting and light in colour.
Best uses: cold-pressed rapeseed oil is excellent for dressings and drizzling, with a flavour profile distinct from olive oil. Refined rapeseed oil works well for roasting, baking, and frying.
Health profile: rapeseed oil has one of the lowest saturated fat contents of any cooking oil and a favourable ratio of omega-3 to omega-6 fatty acids.
Butter and Ghee
Smoke point: approximately 150 degrees Celsius (butter) or 250 degrees Celsius (ghee)
Butter brings richness and flavour that no oil can replicate, but its low smoke point and milk solids mean it burns easily. Ghee, or clarified butter, has the milk solids removed, which raises its smoke point dramatically and gives it a nutty, caramelised flavour.
Best uses: butter for finishing sauces, baking, and gentle sauteing. Ghee for high-heat frying, Indian cooking, and anywhere you want the richness of butter without the risk of burning.
Tip: for the best of both worlds, cook with a blend of butter and a neutral oil. The oil raises the overall smoke point while the butter contributes flavour.
Quick Reference Table
- Very high heat (searing, deep frying): avocado oil, ghee, refined rapeseed oil
- High heat (roasting, stir-frying): light olive oil, vegetable oil, sunflower oil, refined coconut oil
- Medium heat (sauteing, baking): extra virgin olive oil, butter, light sesame oil
- No heat (dressings, finishing): extra virgin olive oil, toasted sesame oil, cold-pressed rapeseed oil, nut oils
Storing Your Oils
Heat, light, and air are the enemies of cooking oil. Store all oils in a cool, dark cupboard away from the hob. Keep bottles tightly sealed. Delicate oils like toasted sesame, walnut, and flaxseed should be stored in the fridge after opening, where they will keep for several months. If an oil smells stale or tastes bitter, discard it. Rancid oil will spoil any dish it touches.
The Bottom Line
You do not need a dozen bottles cluttering your kitchen. A good extra virgin olive oil, a neutral high-heat oil, and butter or ghee will cover the vast majority of your cooking. Add sesame oil if you cook Asian food regularly, and coconut oil if you enjoy its flavour. Beyond that, let your cooking style and preferences guide you.