Discussion
An oil whose viscosity is measured as \( U = 60 \), with reference oils at \( L = 100 \) and \( H = 50 \), has a viscosity index of
Answer: D
Correct answer: 80
The viscosity index compares the oil against two reference oils of the same viscosity at 100 degrees: \[ VI = \frac{L - U}{L - H} \times 100 = \frac{100 - 60}{100 - 50} \times 100 = 80. \] L is the poor reference and H the good one, so an oil matching H would score 100 and one matching L would score zero.
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