Oil Wear-Metal Alert Levels

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{Alert} = \text{ppm} > 2\times \text{baseline or fleet 95}^\text{th}

Symbol	Meaning	Unit
$Fe$	Iron - liners, pistons, gears	ppm
$Cu$	Copper - bronze bushings / cooler tubes	ppm
$Pb$	Lead - white-metal bearings	ppm
$Si$	Silicon - catalyst fines / dust	ppm

Source: ASTM D5185 - ICP-OES wear metals

Flag ICP wear-metal concentrations against typical trending limits - a step change of >2\u00d7 baseline is the classic CBM alert.