An indication of bearing problems could be __________.

• A. Low acoustic levels
• B. Suspended metal found during an oil analysis
• C. Clean oil with low viscosity
• D. High fuel content

Answer: (B)

When assessing bearing health, oil analysis is a go-to diagnostic tool. As bearings wear, tiny metal particles are shed into the lubricant. If laboratory or on-site oil analysis detects suspended metal in the oil, it signals that wear is occurring in bearing surfaces and could indicate developing bearing problems. This debris travels with the oil, so finding metal particles is a practical warning sign that lubrication is no longer pristine and bearings may need attention.

Low acoustic levels wouldn’t typically point to bearing trouble; a failing bearing often brings increased noise or vibration. Clean oil with low viscosity doesn’t by itself indicate bearing issues—cleanliness is good, and viscosity only hints at lubrication performance, not direct wear. High fuel content suggests fuel dilution or contamination, not bearing wear.