ASTM International

SHEAR STABILITY OF MULTIGRADE ENGINE OILS - Institute of Petroleum Fleet Tests
 N DS49S1

Annotation

INTRODUCTION AND BACKGROUND

In 1969, ASTM R&D Div. VII B-l Subsection on the shear stability of crankcase oils initiated a program "to study ways of evaluating the shear stability of polymer-containing oils under conditions closely related to service". Since then, 13 ASTM Reference Oils (ARO's) were formulated and evaluated in six United States car fleets and in a variety of bench tests. These results are summarized in ASTM data series report, DS49, published in early 1973.(1)*

The current report summarizes data from two fleets which were used in tests conducted by the Institute of Petroleum members recently. One fleet was made up of cars which used the same oil charge in both the engine and the transmission (hereafter referred to as integral gear box cars). The other fleet was of conventional design. Both fleets had seven cars and each fleet evaluated seven of the 13 ARO's although the seven were not the same oils in each case.

Regression analyses were conducted to determine how well the various fleets agreed and to see if any of the bench tests could satisfactorily predict an oil's shear stability as determined with the integral gear box car fleet.

*Numbers in parentheses designate references at the end of report.

Автоматический перевод:

SHEAR STABILITY OF MULTIGRADE ENGINE OILS - Институт нефтяных быстроходных тестов