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    Development of an ASTM Standard Test Method for Measuring Engine Oil Viscosity Using Capillary Viscometers at High-Temperature and High-Shear Rates

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    The development of a standard ASTM test method for measuring engine oil viscosity at high temperature (150°C) and high rate of shear (106 S-1) is discussed. A review is provided of the ASTM interlaboratory program that incorporated several different viscometer designs to evaluate a single generalized procedure for viscosity determination. A statistical analysis for ASTM repeatability and reproducibility resulted in a level of precision that approached that of rotational high-temperature, high-shear viscometers. Excellent correlation between capillary viscometers and rotational instruments is also demonstrated. The method is applicable to existing high-temperature, high-shear viscosity requirements in the European Committee of Common Market Automobile Constructors (CCMC) specification as well as individual high-temperature, high-shear specifications established by original equipment manufacturers.


    lubricating oil, viscosity, viscometer, standards, shear rate, high temperature tests, capillary, specification

    Author Information:

    Demko, JM
    Industry liaison manager, Castrol, Inc., Piscataway, NJ

    Committee/Subcommittee: D02.07

    DOI: 10.1520/STP23000S