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Viscometric properties of a multigrade motor oil in relation to its bright‐stock content
Author(s) -
El Naga H. H. Abou,
Bendary S. A.
Publication year - 1993
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010050302
Subject(s) - viscosity index , viscosity , chemistry , motor oil , relative viscosity , copolymer , reduced viscosity , polymer chemistry , base oil , chemical engineering , organic chemistry , thermodynamics , materials science , composite material , polymer , physics , scanning electron microscope , engineering
Viscometric properties for a multigrade motor oil with SAE 20W/50 viscosity grade were studied in the presence of different viscosity index improvers. The neat base blends contained increasing percentages of a bright‐stock. Measured viscometric properties for both the neat and VI improved blends included the following: kinematic viscosity, viscosity increase by incorporation of a VI improver, viscosity index, specific viscosity and thickening tendency. These measurements were carried out over a wide temperature range. Increase of the bright‐stock content showed that most of the VI improvers behave as thickeners. Polyalkylmethacrylate and styrene‐isoprene copolymers were found to be the only exception from such behaviour for the VI improvers.