Abstract
A recent trend and need is towards formulating energy efficient lubricants as fuel efficiency has become a critical component of industry's operating efficiency. However, compatibility of friction modifiers (FM) with existing additives, specially surface-active types, needs to be examined beforehand. The effect of oil-soluble commercial organomolybdenum compounds on the extreme pressure (EP) and antiwear (AW) properties of most commonly used S-containing EP/AW agents has been investigated on a four-ball machine. While mostly complementary and exclusory interactions were observed in some cases graded response was also noticed. Based on this extensive study, involving three oil-soluble organomolybdenum FM and four EP/AW agents of varying chemistries, the most synergistic FM-AW-EP combination was identified. The selected combination, when incorporated into a fully formulated industrial gear oil formulation, resulted in marked enhancement in EP/AW properties and a substantial improvement in frictional characteristics.
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