Check the identity before the result
Confirm asset, compartment, sample date, fluid grade and machine and oil hours. Check whether the sample represents the normal operating state. Record recent oil additions, changes and repairs before comparing it with earlier samples.
Separate the measurements
Particle count concerns contamination; a water result concerns moisture; viscosity and chemistry help assess whether the lubricant remains suitable. None replaces the others. Read units, test methods, laboratory comments and the equipment-specific limits together.
- Particle result: method and agreed cleanliness target
- Water: units, method and sample conditions
- Viscosity: test temperature and fluid specification
- Wear and chemistry: laboratory interpretation and historical trend
Make like-for-like comparisons
Build a dated trend using consistent sampling points and methods. A fresh oil charge or large top-up can change concentrations without resolving the cause. A different laboratory method can make a direct comparison misleading. Ask the laboratory to explain changes rather than silently converting unlike results.
Record a decision and an owner
For an abnormal result, agree whether the next step is a repeat sample, ingress investigation, further testing or intervention under site procedures. Record the responsible person and review date. A clean particle count alone is not approval to continue using degraded oil or extend the service interval.