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/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Pless, L G
• Publication Date: 1975-10

Media Info

• Pagination: 15 p.

Subject/Index Terms

• TRT Terms: Catalytic converters; Economic efficiency; Engine oils; Exhaust gases; Gasoline; Mineral deposits; Performance; Testing; Unleaded gasoline; Vehicle power plants; Wear
• Uncontrolled Terms: Efficiency
• Old TRIS Terms: Ashes; Automobile engines; Deposits; Lead free
• Subject Areas: Economics; Geotechnology; Highways; Materials; Safety and Human Factors; Vehicles and Equipment;

Filing Info

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