Influencing oil degradation

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Parameters including total base number (TBN), total acid number (TAN), wear metal analysis (including iron, lead and copper) and nitration and oxidation have all traditionally been used to study the effects of oil degradation.


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Although they go some way to helping us qualify the condition of the oil, what is really missing is a method that conclusively answers the most important question: when has the engine oil reached its condemnation point? This is a particularly pertinent question for Infineum as we work to maintain and even increase engine oil lifetime with novel additives and formulation approaches whilst working within ever-tightening chemical constraints.


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The work undertaken by Infineum gives new insights into the ageing processes of engine oils. We have learned that traditional IR techniques are unable to indicate the rate of nitration and that the height of the nitrate ester peak gives little information about the extent of oil degradation. Equally, running engine tests at artificially high temperatures contributes little to the understanding of ‘real world’ oil condition monitoring, because high sump temperatures engage a reaction path which is not usually present in the field to any great extent.

The INOx rig test agrees closely with the observed rates of oxidation and nitration in real-world test conditions. In conjunction with other traditional indicators of oil degradation, the INOx rig is a valuable tool for research into oil ageing and formulation effects.
 
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