Prepositions with nouns

Of oil, in oil, or for oil?

These combinations have different meanings. In oil usually describes a substance or cooking method, of oil shows composition or amount, and for oil often expresses purpose.

Quick answer

Common uses of oil with prepositions

Use in oil for something covered, cooked, or preserved in oil. Use of oil for quantity or composition. Use for oil when talking about purpose, demand, or searching.

The vegetables were fried in oil.
The lamp uses a small amount of oil.
They drilled for oil near the coast.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
in oil

Describing cooking or immersion

Use in oil when something is cooked, preserved, or covered with oil.

The fish was cooked in oil.
Olives preserved in oil taste richer.
2
of oil

Showing amount or composition

Use of oil after nouns that express quantity, type, or content.

a bottle of oil
The smell of oil filled the garage.
3
for oil

Expressing purpose or search

Use for oil when discussing drilling, demand, or equipment intended for oil.

The company searched for oil offshore.
new regulations for oil transport

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
in oil
The sardines were packed in oil.
Shows that something is inside or covered with oil.
of oil
We bought a litre of oil.
Shows quantity or material.
for oil
The region is famous for oil drilling.
Shows purpose, target, or connection.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using of oil for cooking method

Use in oil when describing how food is cooked.

✕ The onions were fried of oil. ✓ The onions were fried in oil.

Using in oil for quantity

Use of oil after measurements and containers.

✕ a bottle in oil ✓ a bottle of oil

Quick practice

Choose the expression that matches the intended meaning.

1. The potatoes were cooked ___ oil.
2. We need another litre ___ oil.
3. The company drilled ___ oil in the desert.

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Frequently asked questions

Can I say cooked of oil?

No. Use cooked in oil to describe the cooking method.

What does for oil mean?

It usually refers to purpose or searching, such as drilling for oil.

Is of oil always correct after a noun?

No. It is mainly used for quantity, type, or composition, such as a drop of oil.

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