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SEM morphologies of the worn surfaces lubricated with (a) pure diesel oil, (b) 0.1 wt.% MoS2 nano lubricants, (c) 0.4 wt.% MoS2 nano lubricants, (d) 0.7 wt.% MoS2 nano lubricants, (e) 0.1 wt.% ZnO nano lubricants, (f) 0.4 wt.% ZnO nano lubricants, (g) 0.7 wt.% ZnO nano lubricants.
