Research Article
Correlation Study of Physicochemical, Rheological, and Tribological Parameters of Engine Oils
Table 7
Correlation coefficient matrix for lubricant properties (physicochemical and tribological).
| | @ 15°C g-cm−3 | @ 40°C | @ 100°C | VI | TAN | TBN | Sulphated ash | Zn | Mo | P | COF | WSD |
| @ 15°C g-cm−3 | 1 | 0.83 | 0.73 | 0.73 | 0.08 | 0.59 | −0.68 | 0.08 | 0.92 | 0.01 | 0.41 | 0.75 | @ 40°C | 0.83 | 1 | .91 | 0.90 | −0.53 | 0.91 | −0.50 | −0.15 | 0.95 | 0.22 | 0.73 | 0.78 | @ 100°C | 0.73 | .91 | 1 | 0.76 | −0.34 | 0.85 | −0.46 | 0.02 | 0.88 | −0.04 | 0.68 | 0.81 | VI | −0.73 | −0.90 | −0.76 | 1 | 0.71 | 0.94 | 0.13 | 0.53 | −0.83 | 0.60 | −0.92 | −0.97 | TAN | −0.08 | −0.53 | −0.34 | 0.71 | 1 | 0.70 | 0.33 | 0.96 | −0.20 | 0.98 | −0.84 | −0.55 | TBN | −0.59 | −0.91 | −0.85 | 0.94 | 0.70 | 1 | 0.08 | 0.50 | −0.76 | 0.56 | −0.92 | −0.91 | Sulphated Ash | −0.68 | −0.50 | −0.46 | 0.13 | 0.33 | 0.08 | 1 | 0.51 | −0.46 | −0.47 | −0.31 | −0.45 | Zn | 0.08 | −0.15 | 0.02 | 0.53 | 0.96 | 0.50 | −0.51 | 1 | 0.03 | 0.99 | −0.79 | −0.42 | Mo | 0.92 | 0.95 | 0.88 | 0.83 | 0.20 | 0.76 | −0.46 | 0.03 | 1 | −0.04 | 0.55 | 0.88 | P | 0.01 | −0.22 | −0.04 | 0.60 | 0.98 | 0.56 | −0.47 | 0.99 | −0.04 | 1 | −0.83 | −0.49 | COF | 0.41 | 0.73 | 0.68 | −0.84 | −0.84 | −0.92 | −0.31 | −0.79 | 0.55 | −0.83 | 1 | 0.82 | WSD | 0.75 | 0.91 | 0.76 | −0.97 | −0.55 | −0.91 | −0.45 | 0.88 | −0.35 | 0.65 | 0.82 | 1 |
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Not relevant.
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