Oil Wear-Metal Alert Levels
Flag ICP wear-metal concentrations against typical trending limits - a step change of >2× baseline is the classic CBM alert.
Fe status
Alert
Cu status
OK
Pb status
OK
Si status
Alert (cat fines / dust ingress)
Formula, assumptions, and limits
Fleet-typical trending thresholds for lube oil. Always trend against the asset's own baseline after an oil change - absolute ppm is less informative than rate of change. Fleet 95th-percentile tables are published by ExxonMobil, Shell and Chevron lab services.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Iron - liners, pistons, gears | ppm | ICP-OES | |
| Copper - bronze bushings / cooler tubes | ppm | ICP-OES | |
| Lead - white-metal bearings | ppm | ICP-OES | |
| Silicon - catalyst fines / dust | ppm | ICP-OES |