Usage Note
Gasóleo is the standard Spanish term for diesel fuel, especially in Spain; diésel is also widely used and understood. Gasóleo specifically refers to the petroleum distillate used in diesel engines and heating, as distinct from gasolina (petrol/gasoline). Note the written accent on the o: gasóleo is a proparoxytone (stress on the antepenultimate syllable).
Examples
"El depósito está lleno de gasóleo."
Natural Translation
The tank is full of diesel.

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