Correct answer
A multigrade oil.
A multigrade oil is one that meets the requirements of more than one grade in the SAE viscosity classification and can be used over a wide temperature range. The number 15W actually refers to the ease with which the oil can be 'pumped' at low temperatures; the lower the 'W' number, the better its low-viscosity properties.
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A single-grade oil.
An oil exclusively for diesel engines that are very sensitive to temperature changes.
A multigrade oil.
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