Table 2.
Average lube oil properties for fresh oil and after 125 hr of engine operation (ACES Phase 2)
| ASTM test | Test property description | Units | Fresh lube oil | Used oil (Avg.)a | Used oil (min/max) |
|---|---|---|---|---|---|
| D445 | Viscosity at 100°C | cSt | 15.38 | 16 | 13/21 |
| D445 | Viscosity at 40°C | cSt | 116.8 | 97 | 79/112 |
| D5185S | Sulfur by ICP | ppm | 4018 | 3467 | 3144/3660 |
| D5185 | Elemental Analysis | ||||
| Boron | ppm | 1 | 5 | 2/10 | |
| Calcium | ppm | 2233 | 2166 | 2022/2212 | |
| Copper | ppm | <1 | 38 | 8/98 | |
| Iron | ppm | 2 | 15 | 13/17 | |
| Lead | ppm | <1 | 3 | 2/3 | |
| Magnesium | ppm | 6 | 124 | 71/190 | |
| Manganese | ppm | <1 | 4 | 2/6 | |
| Phosphorus | ppm | 1020 | 971 | 964/981 | |
| Silicon | ppm | 4 | 21 | 4/30 | |
| Sodium | ppm | <5 | 6 | 5/8 | |
| Tin | ppm | <1 | 3 | 3/3 | |
| Zinc | ppm | 1157 | 1164 | 1136/1187 | |
Notes: aAverage was based on three analyses of the used lube oil, one per engine.