Abstract
The APP (antipitting properties) level is a major factor in determining the life of bearings. This paper points out that paraffinic hydrocarbons are poorer than naphthenic or aromatic hydrocarbons in APP. Additives are used that are already known to be effective in reducing wear in an effort to improve the APP of isoparaffinic oil. The APP of oils based on isoparaffinic hydrocarbons can be improved by the addition of additives containing chlorine or sulfur and phosphorus. If the oil contains an active antiwear additive based on organic phosphorus compounds, its APP can be improved by replacing this additive by an all-purpose antipitting and antiwear additive containing sulfur and phosphorus.
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