Causes and Effects of Sludge Formation in Motor Oils

340090

01/01/1934

Event
Pre-1964 SAE Technical Papers
Authors Abstract
Content
SINCE it appeared reasonably certain that the key to the presence of sludge deposits, regardless of form, lies in the oxidation of the oil to give the small amounts of asphaltic substances which are inevitably present, the authors prepared the following paper to summarize and appraise the evidence on this point and to present a method for measuring oil stability.
After discussing sludge, its composition and effects, engine observations of oil oxidation are stated and the conclusions are reached: (a) that appreciable oxidation of each of the oils occurred in a 50-hr. run; that (b), variation in engine output markedly influenced oxidation of the oils while variation in sump temperatures did not; and (c), that even with the wide difference in the character of the oils used, chloroform insoluble material (“carbon”) did not vary greatly but appeared to be determined mainly by engine condition.
A comparison of laboratory and engine tests is made and the Indiana Oxidation Test is described. Service observations are stated and commented upon. In conclusion it is said that the indication is that the formation of sludge in motor oils is due primarily to asphaltenes resulting from oxidation of the oil.
Meta TagsDetails
DOI
https://doi.org/10.4271/340090
Pages
13
Citation
Barnard, D., Barnard, E., Rogers, T., Shoemaker, B. et al., "Causes and Effects of Sludge Formation in Motor Oils," SAE Technical Paper 340090, 1934, https://doi.org/10.4271/340090.
Additional Details
Publisher
Published
Jan 1, 1934
Product Code
340090
Content Type
Technical Paper
Language
English