Practice question

In a multi-grade engine oil such as 10W-30, what do the numbers '10W' and '30' represent?

  1. 10W is the oil weight in kilograms, and 30 is the boiling point
  2. 10W is the oil's low-temperature (winter) viscosity grade, and 30 is the oil's high-temperature (100 degrees C) viscosity grade
  3. 10W means the oil lasts 10,000 km, and 30 means it is for 30-weight engines
  4. 10W is the oil's flash point, and 30 is the oil's pour point

Answer: B — 10W is the oil's low-temperature (winter) viscosity grade, and 30 is the oil's high-temperature (100 degrees C) viscosity grade

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