Thursday, 24 August 2017 11:15

Lube Tip: How Oxidation Changes Oil

How oxidation changes oil

Once the oxidation process occurs, five major changes in the oil result in the following:

  1. Colour becomes darker – changes from transparent or translucent in colour to some degree of discoloration toward the point of complete opacity.
  2. Odour becomes pungent and acetic due to the presence of excessive organic petroleum acid and similar products of oxidation.
  3. Acidity increases – changes from a neutralisation number from 0.06 to 0.12 KOH mg/g to well above 2.0 can occur.
  4. Viscosity increases – the viscosity of an oil frequently may double or triple due to oxidation. Oxidative thickening is capable of producing fluids that have the consistency of molasses-like sludge under high operating temperature conditions.
  5. Insolubles precipitate (sludging occurs) – after an induction period, the deterioration of an oil gradually accelerates until the formation of organic acids of deposition of sludge completely destroys the oil.


Courtesy of Noria Corporation.

Social Media links

More stories

Renewable energy
WearCheck recently conducted training courses for wind turbine manufacturers Nordex and Acciona at Ca...
146 Hits
Clearance-sized particles
One of the most important size particles to control in lubricants and hydraulic oils is clearance-siz...
181 Hits
Transformer Division Goes The Extra Mile…
Many extra miles, in fact! Ian Gray, manager of WearCheck’s transformer services division, and Des ...
376 Hits
WearCheck passes audit with flying colours
WearCheck recently underwent its annual audit by a customer - Siemens - where the audit scope was on ...
183 Hits
Budding scientists visit WearCheck
36 grade 11 pupils from Curro Grantleigh High School in Richards Bay recently visited WearCheck’s P...
141 Hits