Table 7: Correlation coefficient matrix for lubricant properties (physicochemical and tribological).

@ 15°C
g-cm−3
@ 40°C @ 100°CVITANTBNSulphated
ash
ZnMoPCOFWSD

@ 15°C g-cm−310.830.730.730.080.59−0.680.080.920.010.410.75
@ 40°C0.831.910.90−0.530.91−0.50−0.150.950.220.730.78
@ 100°C0.73.9110.76−0.340.85−0.460.020.88−0.040.680.81
VI−0.73−0.90−0.7610.710.940.130.53−0.830.60−0.92−0.97
TAN−0.08−0.53−0.340.7110.700.330.96−0.200.98−0.84−0.55
TBN−0.59−0.91−0.850.940.7010.080.50−0.760.56−0.92−0.91
Sulphated
Ash
−0.68−0.50−0.460.130.330.0810.51−0.46−0.47−0.31−0.45
Zn0.08−0.150.020.530.960.50−0.5110.030.99−0.79−0.42
Mo0.920.950.880.830.200.76−0.460.031−0.040.550.88
P0.01−0.22−0.040.600.980.56−0.470.99−0.041−0.83−0.49
COF0.410.730.68−0.84−0.84−0.92−0.31−0.790.55−0.8310.82
WSD0.750.910.76−0.97−0.55−0.91−0.450.88−0.350.650.821

Not relevant.