Smoke point: the temperature that matters
Every oil has a smoke point — the temperature at which it breaks down, starts smoking, and releases bitter, potentially harmful compounds. Using the wrong oil at the wrong heat is the #1 cause of foul-tasting pan-sears and ruined deep fries.
High-heat cooking (searing steak, stir-fry, deep fry) needs oils above 400°F smoke point. Medium heat (sauté, roast) tolerates 350-400°F. Low/no heat (finishing, salads) can use any oil.
The comparison table
Refined avocado oil: 520°F smoke point. Neutral flavor. Best all-purpose high-heat oil. $$$ per oz.
Light (refined) olive oil: 465°F. Neutral. Good for frying. $
Peanut oil: 450°F. Slight nutty flavor. Classic for wok cooking. $$
Grapeseed oil: 420°F. Neutral. Good sauté oil. $$
Canola oil: 400°F. Neutral. Cheap everyday frying. $
Corn oil: 450°F. Neutral. Industrial deep fry. $
Sunflower oil: 440°F. Neutral. $$
Ghee: 485°F. Buttery flavor. Indian cooking. $$
Extra-virgin olive oil: 375°F (varies by quality). Flavor-forward. Salad dressings and medium-heat. $$
Butter: 350°F. Browns. Use for finishing or low-heat sauté. $
Coconut oil (virgin): 350°F. Tropical flavor. $
Sesame oil (toasted): 350°F. Strong flavor. Finishing only.
Flaxseed oil: 225°F. No-heat; salads only. $$$$
Cost per use
For daily cooking, canola and vegetable oil (blended soy/canola) are cheapest. Olive oil and avocado oil are 3-5× more expensive but offer flavor and health perks. Budget-wise: canola for frying, olive for everything else. Don't waste $20 avocado oil on medium heat — canola performs identically at sauté temperatures.
Flavor vs. function
Flavor-forward: extra-virgin olive, toasted sesame, butter, ghee, coconut, flaxseed.
Neutral: canola, grapeseed, vegetable, refined avocado, light olive.
Neutral oils let the food taste like itself. Flavor-forward oils contribute to the dish.
Health considerations
Omega-6 to omega-3 ratio matters for inflammation. Ideal ratio: 4:1 or lower.
Corn, soybean, sunflower, safflower oils are high in omega-6 (high ratio). Olive, avocado, flaxseed, fish oils are better (low ratio).
Industrial seed oils have become health-controversial — some research suggests high intake contributes to chronic inflammation. Moderation is the safe answer; full avoidance isn't necessary for most people.
Storage
Light and heat destroy oil. Store in dark glass or opaque plastic, in a cool pantry. Away from stove heat. Olive oil in clear glass on a sunny counter: 3 months. Dark bottle in a pantry: 18 months.
Rancid oil smells like crayons. Toss.
The 3-oil pantry
If you only buy 3: good extra-virgin olive (for everything medium and below), canola or avocado (for high heat), toasted sesame (for finishing Asian dishes).
Related: flour compare, cups to grams, cooking time by weight.
Frequently asked
Is olive oil bad for high heat? Refined/light olive oil is fine at 465°F. Extra-virgin olive starts to degrade at 375°F — use for medium heat and finishing.
Why does my pan smoke even with high-heat oil? Pan is hotter than the smoke point. Drop the heat.
Can I reuse frying oil? Yes, 2-3 times if strained. Discard when dark or foul-smelling.
Is avocado oil worth it? For high-heat searing and frying: yes. For medium heat: no (canola works).
Best oil for popcorn? Coconut oil (flavor) or peanut oil (classic movie-theater). Both handle popping temperatures.