Study on Oil Soluble Dispersants (Part 1)

Abstract

One of the most widely used techniques applied on the used oil analysis is the quantitative determination of insoluble matters in the oil. The authors found that the amount of insoluble matters in the oil does not necessarily correlate with engine cleanliness and thought that it seems more practical to establish a test method which is capable of detecting remaining dispersancy of engine oils of unknown history independent of engine cleanliness.The authors applied the technique of the DISPERSANCY TEST described in Part 1 of this report to develop a new test procedure which enables to decide the necessity of oil drain, by detecting the remaining dispersancy of used oils, independent of operating conditions, engine makes, and level of dispersant in the fresh oils.By the experiments, it was confirmed that the artificial sludge is, in many cases, a better coagulant than butyl diethanol amine because of its lower selectivity to the types of dispersants.