A multigrade lubricating oil means an oil having high __________________?
Correct answer: B. Viscosity index
- A. Viscosity
- B. Viscosity index
- C. Aniline point
- D. Flash point
Explanation
A multigrade oil maintains suitable viscosity over a broad temperature range, which requires a high viscosity index. Flash point and aniline point do not describe this temperature-viscosity performance.
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