VISCOSITY EFFECTS ON ENGINE WEAR UNDER HIGH-TEMPERATURE, HIGH-SPEED CONDITIONS

Four multigrade engine oils, containing the same base oil plus SE additive package but polymeric viscosity-index improvers of differing shear stability, were evaluated in 80 000 km of high-speed, high-temperature vehicle service. Bearing, piston ring and valve guide wear, as well as oil consumption, oil filter plugging and engine cleanliness were all worse for the engines operated on the low-shear stability oils. The wear differences were traced to differences in high-shear-rate viscosity, while the cleanliness, filter plugging and oil consumption differences occurred because of excessive wear or polymer shear degradation. These results suggest that engine oil viscosity should be specified under high-shear-rate conditions.

  • Supplemental Notes:
    • SAE Special Publication 434 (Relationship Between Engine Oil Viscosity and Engine Performance--Part 4). Presented at the SAE Internation Fuels and Lubrication Meeting, Toronto, Ontario, 13-16 November 1978.
  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • MCMILLAN, M L
    • Rosenberg, R C
    • Murphy, C K
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00195260
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Aug 28 1979 12:00AM