DEPOSITS, WEAR, AND CATALYST PERFORMANCE WITH LOW ASH AND ASHLESS ENGINE OILS

Tests were run using 95, 1972-1973 model passenger cars, operated with unleaded gasoline in several types of service. Forty cars were equipped with 1975 production-prototype underfloor catalytic converters containing pelleted oxidation catalysts. Neither exhaust emissions nor catalyst conversion efficiency were affected by using either a low ash or an ashless oil instead of a conventional oil. Five experimental ashless oils were all deficient in engine performance in varying degrees, compared to conventional commercial SE-QUALITY oils, with respect to cam and lifter wear, oil ring sticking, and piston varnish deposits. It is concluded that reduction in phosphorus or metals content of current, conventional, commercial oils does not appear to be necessary to meet current exhaust emmission standards with current General Motors (GM) catalyst systems./GMRL/

Media Info

  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00131070
  • Record Type: Publication
  • Report/Paper Numbers: SAE #750900
  • Files: TRIS
  • Created Date: Apr 21 1976 12:00AM