DETERIORATION in performance of a detergent oil usually corresponds with changes in dispersancy and the electron microscope enables these changes to be observed in detail. An earlier paper (abstracted in our December, 1952 issue, p. 23) dealt with this work, but a more recent paper has given details of how this work is carried out. This paper was given by J. B. Peri of the California Research Corporation, at the Society of Automobile Engineers National Fuels and Lubricants Meeting in Chicago in November. We have extracted the main points from this paper hereunder.
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