Abstract
The improved additive response associated with additional refining of lubricating oil base stocks has been partly attributed to aromatic hydrocarbon removal. The validity of this theory was investigated by following the changes in steel-on-steel friction that resulted from the addition of representative aromatic hydrocarbons to blends containing a chlorinated wax, a sulfurized terpene oil or didodecyl phosphite as additives. Although some added aromatics did affect friction and surface coating formation during the original testing, the effects were generally eliminated if the aromatic was percolated through silica gel prior to test. Studies indicated that the originally observed effects of aromatics were probably caused by aromatic oxidation products rather than the parent hydrocarbon. Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE International Lubrication conference held in New York City, October 9–12, 1972
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