Antifriction and antiwear performance of three soluble molyb&num (Mo) compounds (Mo dithiophosphate, Mo dithiocarbamate and Mo amine complex) and four sulphur-containing EP additives (sulphurised isobutylene, dibenzyl disulphide, sulphurised fat and synthesised ethylene sulphur derivative) havebeen studied, alone and in combination, using a n SRV test rig.
The additive behaviour in Combination has been found to be selective, and dependent on the chemistry and ratio of the additive components. Certain sulphur EP additives in combination withMo compounds have exhibited a synergistic effect. The antifriction performance of additives, in general, has been found to be further enhanced at higher test temperatures. However, a reduction in antiwear property has been noticed.