Characteristics of diesel engine soot that lead to excessive oil thickening

Christine Esangbedo, André L. Boehman, Joseph M. Perez

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


This is a study of soot from a heavy duty diesel (HDD) engine test designed to evaluate the soot handling ability of a lubricant. This study aims to understand what properties of diesel soot produced under certain conditions contribute to loss of viscosity control through examination of the morphology, nanostructure and oxygen functionalization of particulates obtained from two heavy duty diesel engine tests with different levels of EGR. Particulate samples obtained from the used engine oil that lost viscosity control at relatively low soot levels showed that the soot in this case was more graphitic and had lower oxygen functionalization.

Original languageEnglish (US)
Pages (from-to)194-203
Number of pages10
JournalTribology International
StatePublished - Mar 2012

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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