Correct answer
A multigrade oil.
It is multigrade: it meets the requirements of grade 15W at low temperature and grade 40 at high temperature. These numbers are viscosity grades, not operating temperatures or two separate oils. Oil generally becomes less viscous as it heats; a multigrade controls that variation and meets the required performance in both tests. Use the viscosity and specification required by the engine manufacturer.
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A multigrade oil.
A single-grade oil.
An oil equivalent to SAE 25 obtained by adding and dividing the numbers.
The real exam in English is a translation of the Spanish original; compare both here.
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¿Qué tipo de aceite es un lubricante clasificado SAE 15W-40?
- Un aceite multigrado.(Correct answer)
- Un aceite monogrado.
- Un aceite equivalente al grado SAE 25 obtenido sumando y dividiendo los números.
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