Research Article
Experimental Comparison of the Effect of Using Synthetic, Semi-Synthetic, and Mineral Engine Oil on Gasoline Engine Parts Wear
Table 7
Oil analysis results for viscosity, TBN, and flash point at the first stage.
| Oil statues | Fresh oil | Used oil |
| Stages | | Stage 1 @ load 1 = 50% rated power |
| Operation hours × 100 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Mineral oil | Viscosity@40°C ST (cSt) | 109.9 | 116.8 | 86.4 | 93.7 | 102.6 | 103.9 | 108.3 | 105.3 | 108.3 | 105.3 | Viscosity@100°C ST (cSt) | 13.8 | 14.2 | 11.6 | 12.2 | 13.4 | 13.2 | 13.9 | 13.6 | 14.1 | 14.6 | TBN (mg KOH/g oil) | 13.5 | 12.0 | 10.5 | 10.1 | 9.9 | 9.6 | 8.9 | 8.6 | 8.9 | 8.6 | Flash point (°C) | 220 | 228 | 205 | 200 | 200 | 190 | 204 | 198 | 200 | 202 |
| Semisynthetic oil | Viscosity@40°C (cSt) | 125.6 | 95.5 | 82.7 | 84.6 | 97.5 | 94.0 | 92.2 | 98.3 | 99.2 | 99.7 | Viscosity@100°C (cSt) | 15.2 | 12.7 | 11.8 | 11.4 | 13.1 | 12.7 | 12.5 | 13.4 | 14.3 | 14.9 | TBN (mg KOH/g oil) | 13.2 | 11.9 | 13.2 | 11.8 | 11.6 | 11.2 | 10.4 | 10.0 | 10.1 | 10.0 | Flash point (°C) | 250 | 222 | 220 | 219 | 216 | 204 | 216 | 200 | 190 | 180 |
| Synthetic oil | Viscosity@40°C (cSt) | 103.33 | 78.3 | 78.6 | 81.4 | 78.3 | 78.6 | 80.0 | 81.4 | 87.1 | 85.5 | Viscosity@100°C (cSt) | 15.46 | 14.2 | 13.4 | 12.7 | 14.2 | 13.4 | 13.0 | 12.7 | 13.7 | 13.3 | TBN (mg KOH/g oil) | 13.19 | 12.4 | 12.0 | 11.7 | 12.4 | 12.0 | 11.8 | 11.7 | 10.0 | 8.2 | Flash point (°C) | 228 | 190 | 204 | 205 | 190 | 204 | 203 | 205 | 206 | 200 |
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