Oil Analysis
Oil analysis is the laboratory or field examination of lubricant condition, contamination, and wear debris to assess both the lubricant and the equipment it protects.
What this term means in maintenance
Oil analysis is the laboratory or field examination of lubricant condition, contamination, and wear debris to assess both the lubricant and the equipment it protects.
What oil analysis examines
Tests may assess:
- Viscosity
- Water
- Particle count
- Oxidation
- Acidity
- Additive condition
- Fuel dilution
- Soot
- Wear metals
- Contaminants
- Ferrous debris
Practical example
Gearbox oil analysis shows increasing iron particles and abnormal silicon contamination. Inspection finds damaged breathers and early gear wear before complete failure.
Sampling quality
A reliable sample should be:
- Taken from a representative location
- Collected while the oil is well mixed
- Free from external contamination
- Labelled with asset and lubricant information
- Collected consistently
- Supported by operating hours and oil age
Trending
One result may identify a severe condition, but trends often provide stronger evidence of deterioration or contamination.
Common mistake
Changing the oil without investigating the source of contamination or wear may remove the evidence while leaving the equipment problem unresolved.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Condition Monitoring
Condition monitoring is the systematic collection and review of equipment-condition information to identify deterioration, abnormal operation, or developing failure.
Lubrication Management
Lubrication management is the controlled selection, storage, handling, application, inspection, and monitoring of lubricants used in equipment.
Predictive Maintenance
Predictive maintenance uses condition data, trends, and analytical methods to estimate when equipment degradation may require maintenance.
Oil Analysis FAQs
- What does oil analysis measure?
It may measure viscosity, water, particles, oxidation, acidity, additives, wear metals, soot, fuel dilution, and contamination.
- Why is sampling location important?
A poor sample may not represent the lubricant or equipment condition and can produce misleading results.
- Should oil be changed immediately after every abnormal result?
Not automatically. The team should confirm the result and investigate the contamination or wear source.