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Used Oil Analysis
Used oil analysis helps ProEdge Lubricants customers make better maintenance decisions when service timing, low usage, equipment health or business uptime matters.
Use testing when guessing creates risk
Oil analysis is most useful when you need evidence before extending a drain, when equipment sits more than it runs, or when a fleet or shop needs a repeatable maintenance record.
Oil analysis case studies
These examples show how oil-analysis results can support practical, conservative maintenance decisions.
2018 Toyota Sienna
18,000 mi on AMSOIL Signature Series 0W-20 at 119,000 mi. Severity 1, with Base Number, silicon, oxidation and additive-level context kept conservative.
View Sienna case studyJohn Deere S100
Owner history places the oil in service for about two years; the lab report verifies 83 h on AMSOIL SAE 5W-30 small-engine oil. The lab said the oil was suitable for continued use at sampling, while silicon was moderate and worth monitoring.
View S100 case study2012 Nissan Quest
32 months and 3,000 mi on AMSOIL Signature Series 5W-30 at 162,000 mi. The time in service was the main reason oil analysis was useful.
View Quest case studyCommon oil-analysis questions
Keep the test result in context with fitment, warranty and service records.
Does oil analysis set my oil-change interval by itself?
No. Treat it as one maintenance input. Follow the shortest applicable manufacturer, AMSOIL or warranty limit unless a lab result supports a documented extension.
Does oil analysis replace the AMSOIL lookup guide?
No. Use Find Your Fit for product, viscosity, filter and capacity matching. Use oil analysis to evaluate the used fluid after service.
What can a qualified lab check?
A lab can review used-oil condition, wear metals, contaminants, fuel dilution, water and fluid properties that help show whether more investigation is needed.
Is this only for cars and trucks?
No. Oil analysis can fit small engines, powersports equipment, fleets, farm equipment and other applications where the maintenance decision justifies testing.
Optional account programs
Buying for repeat personal or business use?
Review official AMSOIL program information after you have found the products you need.