Oxidation stability of some phosphorus-free fully formulated crankcase oils

Behrooz Khorramian, Hakan Kaleli, Joseph Manuel Sr Perez

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


Legislation world-wide has made it necessary to find ways to control the level of engine emissions and reduce the damage to our environment. Increasing restrictions have made the elimination of zinc dithiophosphates from crankcase oils and increasing the effectiveness of catalytic converters viable options. Lead and phosphorus containing compounds in the exhaust are known catalyst poisons that shorten the life of current automotive catalysts. Unleaded fuel has successfully resulted in a reduction of harmful emissions due to the fuel. Current government and industry research is actively pursuing replacement of phosphorus additives with phosphorus free additives. Several phosphorus-free oils were developed and are evaluated in bench tests in this study. Test comparisons with phosphorus-containing oils demonstrated satisfactory oxidation stability and wear performance of the phosphorus free oils.

Original languageEnglish (US)
StatePublished - Dec 1 1998
EventInternational Fall Fuels and Lubricants Meeting and Exposition - San Francisco, CA, United States
Duration: Oct 19 1998Oct 22 1998


OtherInternational Fall Fuels and Lubricants Meeting and Exposition
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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