How to Say "petroleum" in Spanish
The most common Spanish word for “petroleum” is “petróleo” — use 'petróleo' when referring to crude oil as a raw substance, especially in discussions about its price, extraction, or as a commodity.
petróleo
Examples
El precio del petróleo subió esta semana.
The price of oil went up this week.
aceite
ah-SAY-tehaˈsejte

Examples
Este tipo de aceite se usa para la industria.
This type of oil is used for industry.
Necesito un poco de aceite de oliva para la ensalada.
I need a little olive oil for the salad.
El coche necesita un cambio de aceite pronto.
The car needs an oil change soon.
Este aceite corporal huele a lavanda.
This body oil smells like lavender.
Always Masculine
Even though it ends in '-e', 'aceite' is always a masculine word, so you use 'el' or 'un' with it: 'el aceite'.
Uncountable Noun
'Aceite' is usually uncountable, like water or sugar. To measure it, you need a container: 'una botella de aceite' (a bottle of oil).
Using the wrong article
Mistake: “La aceite es saludable.”
Correction: El aceite es saludable. (Remember, 'aceite' is masculine: 'el'.)
petrolero
peh-tro-LEH-rope.tɾo.ˈle.ɾo

Examples
La crisis petrolera afectó a todo el mundo.
The oil crisis affected everyone.
Viven cerca de un pozo petrolero.
They live near an oil well.
La empresa petrolera anunció nuevas inversiones.
The oil company announced new investments.
Matching the word it describes
Since this is an adjective, it must change to 'petrolera' if the thing it describes is a feminine ('girl') word, like 'industria' or 'empresa'.
Don't forget the 'a'
Mistake: “La compañía petrolero.”
Correction: La compañía petrolera.
Aceite vs. Petróleo
Related Translations
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