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IP 48: Determination of oxidation characteristics of lubricating oil

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  • Method adopted/last revised:
  • Method reapproved: 2021
  • REF/ISBN:
  • Status: Current
  • First printed in STM books:

This method indicates the tendency of a lubricating oil to deteriorate on oxidation under specified conditions. A measure of the deterioration is obtained by comparison of the viscosity and carbon residue before and after oxidation. The test is not suitable for additive-type oils (other than those containing ashless additives) or those which form solid products or lose more than 10 % by evaporation during the test.

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