Best Oil for Seasoning Carbon Steel

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Grapeseed, canola, sunflower and avocado oil are the best choices for seasoning carbon steel, because they are neutral and have smoke points above 400°F. Flaxseed builds the hardest layer but flakes more readily. Avoid butter and olive oil, which burn before they polymerise properly.

What makes an oil good for seasoning

Two things matter, and only two.

Smoke point. Oil has to pass its smoke point to polymerise. If your pan never smokes, you have warm oil on steel, and that cools into a sticky film. A higher smoke point gives you more margin.

Fat composition. Polyunsaturated fats polymerise more readily than saturated ones. This is why flaxseed, which is heavily polyunsaturated, forms such a hard layer.

Flavour does not matter. It burns off. Neutral oils are recommended because they are cheap and available, not because taste survives the process.

The oils compared

Smoke points vary with refinement. Refined grapeseed sits higher than unrefined. Treat these as typical published values rather than fixed constants.

The flaxseed argument

Flaxseed gets recommended more than any other oil, and the recommendation deserves scrutiny.

The case for it is real. Flaxseed is highly polyunsaturated, so it polymerises into a genuinely harder, glossier layer than anything else on the list.

The case against is also real, and it is the part that gets left out. Hard means brittle. Flaxseed seasoning flakes off in sheets more readily than a softer layer from grapeseed or canola. Plenty of people have built a beautiful flaxseed finish and watched it peel three months later.

Its smoke point is also the lowest here at around 225°F, which means it burns rather than polymerising if you are heavy-handed with the heat.

Our view: skip it for a first pan. A softer, more forgiving layer that stays put beats a hard one that flakes.

What manufacturers actually use

Worth knowing, because these companies have a commercial reason to get it right.

• Lodge seasons the 10 inch skillet with vegetable oil and the 12 inch with soybean oil.
• Made In uses a blend of shea nut oil and coconut oil.

None of them uses flaxseed. Draw your own conclusion.

Cooking oil is a separate question

These two get conflated constantly.

For seasoning, you want a high smoke point and a neutral character, applied in a film so thin the pan looks dry.

For cooking, use whatever suits the dish. Butter is excellent in a carbon steel pan for flavour. Add it late, after the pan has done its searing work, rather than at the start where it will burn.

Every fatty thing you cook adds seasoning regardless of the oil. Bacon fat seasons a pan beautifully and it is free.

How much to use

Less than feels right. This is the single most common mistake.

About half a teaspoon in a 10 inch pan. Spread it everywhere, then wipe it back until the surface looks almost dry. No shine, no pooling, no beads.

Too much oil cannot polymerise through its full depth. The top sets, the underside stays gummy, and you get the sticky finish that sends people looking for answers.

Full method in how to season a carbon steel pan.

Does the oil choice actually matter?

Less than the internet suggests.

Technique matters far more. A thin coat of cheap canola heated properly beats a thick coat of expensive avocado heated timidly, every time.

If you have sunflower oil in the cupboard, use it. Do not order a specialist product to start.

Frequently asked questions

Smoke points vary by refinement and brand. Figures are typical published values. Last checked 22 July 2026.