Considerable evidence has accumulated to show that aluminum is especially well adapted for the construction of many types of equipment for handling lubricating oils such as sumps, coolers, pistons, pumps, crankcases, and tubing. Therefore, to gain more quantitative data, a study has been carried out at the Aluminum Research Laboratories to compare the effects of various metals and alloys on the properties of lubricating oils at several temperatures. On the basis of this investigation, it appears that aluminum alloys and stainless steel have only a very slight or no catalytic effect on the oxidation of mineral oils and are more resistant than many of the other metals evaluated. Copper and low-carbon steel were found definitely to have an adverse effect upon the properties of the oils.

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