Usually means: Measure of oil's viscosity stability.
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We found 9 dictionaries that define the word viscosity index:

General (4 matching dictionaries)
  1. viscosity index: Merriam-Webster
  2. viscosity index: Infoplease Dictionary
  3. viscosity index: Dictionary.com
  4. Viscosity index: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. viscosity index: Encyclopedia

Tech (4 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Oil Analysis (No longer online)
  3. VISCOSITY INDEX, Viscosity index: Power Engineering

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Definitions from Wikipedia (Viscosity index)

▸ noun:  The viscosity index is an arbitrary, unit-less measure of a fluid's change in viscosity relative to temperature change.

Phrases:
viscosity index improver, more...

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Phrases:
viscosity index improver, more...




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