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Continue to ChatBitesize Diagnosis - element source and limits for lubricated machinery. Where do aluminium, copper, iron, calcium, phosphorus, zinc, lead and tin come from in a lube oil sample. https://learnoilanalysis.com/lube-oil-test-analysis-lab-lubrication-reliability-maintenance/bitesize-diagnosis-element-source-and-limits-for-lubricated-machinery/