With a machinery lubricating oil analysis program, it is important to monitor trends over time. What would be indicated by a sudden increase in metallic content of a recent sample of used diesel engine crankcase lubricating oil?
• Used oil analysis purpose in diesel engines • Relationship between metal particles in oil and engine condition • Differences between wear metals, fuel dilution, and coolant contamination indicators
• If metallic content in the oil suddenly increases, what engine condition would most directly explain more metal particles being carried by the oil? • Which choice options would more likely change viscosity, flash point, or appearance rather than metal levels? • Think about what each type of contamination (fuel, coolant) or chemical change (additive depletion) does to the oil and the type of lab results that would flag each one.
• Match metallic content specifically to a condition that produces metal particles (iron, copper, aluminum, etc.). • Ask: which options would typically be confirmed instead by changes in viscosity, flash point, or water/glycol tests—not by metals alone? • Consider whether the described change is gradual (like additive depletion) or sudden (like a step-change in wear or contamination).
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