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| Concentration of additive (ppm) | Coefficient of friction | Mean wear scar diameter (mm) | Wear scar volume (×10−4 mm3) |
|---|---|---|---|
| 00 | 0.0887 | 0.70 | 15.20 |
| 50 | 0.0831 | 0.69 | 14.64 |
| 100 | 0.0561 | 0.67 | 12.77 |
| 150 | 0.0539 | 0.57 | 5.78 |
| 200 | 0.0850 | 0.66 | 11.91 |
