Table 5 Results of the tests carried out on the four-ball apparatus.
Operating condition | Sample code | Overall mileage [km] | Mileage on oil [km] | Seizure point Pt [N] | Limiting pressure of seizure poz [N/mm2] | Mean values of the wear scar diameter [mm] |
|---|---|---|---|---|---|---|
x̅ ± SD | x̅ ± SD | x̅ ± SD | ||||
New oil | OP | – | – | 2800 ± 100 | 496.26 ± 43.66 | 2.747 ± 0.121 |
City | OP_2384 | 868,964 | 48,864 | 950 ± 132 | 40.32 ± 4.32 | 4.041 ± 0.053 |
OP_2414 | 704,454 | 66,238 | 1833 ± 58 | 956.30 ± 12.01 | 1.980 ± 0.012 | |
OP_2378 | 874,729 | 70,600 | 1700 ± 0 | 1002.94 ± 65.53 | 1.932 ± 0.066 | |
OP_2420 | 77,240 | 77,240 | 1933 ± 58 | 960.38 ± 55.50 | 1.974 ± 0.057 | |
OP_2400 | 130,719 | 80,984 | 1233 ± 58 | 843.63 ± 31.33 | 2.107 ± 0.039 |
