1974-02-01

Temporary Viscosity Loss of Engine Oils 740976

A study on the temporary viscosity loss under high shear rates of engine lubricants was started in order to:
  1. 1.
    Set up a new viscometer, more correlate with the engine than the present ones.
  2. 2.
    Clarify the influence of this phenomenon on the lubricant performances.
Preliminary results on a pressoviscometer are discussed.
Namely it is underlined that the temporary viscosity loss affects both multigrade and unigrade oils, even if at different levels, and in different ways.

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