Keep storage in the review
Read how identification and clean transfer help prevent contamination.
Storage & HandlingBUYER GUIDES
Oil analysis: what the results tell you
A viscosity number, a water result and an oxidation measurement answer different questions. Read them with the product, test method and sample history.
READING AN OIL REPORT
Keep the sample history with the result.
Tell us whether the report describes a new product or oil already in service. Include the product, grade, sampling point, date and operating hours. A result needs its method, units and measurement conditions to support a useful comparison.
Separate product data from a used-oil report.
A technical data sheet describes a product under stated test conditions. A used-oil report describes a sample taken from equipment. Before comparing results, identify the oil, grade, sampling point and service history. Keep the method and units with the numbers.
Read viscosity with the test temperature.
Viscosity describes resistance to flow. It changes with temperature, so results need the measurement conditions. Viscosity index describes how viscosity changes with temperature; it is not an overall quality score. Neither result replaces the grade specified by the equipment manufacturer.
Look at water and contamination together.
Water and particles can enter during storage, transfer or operation. A report should be read with the sample history and the equipment context. An unusual appearance may justify investigation, but color alone does not establish the cause or decide whether an oil is fit for service.
Use each condition test for its own question.
Acid number, base number, oxidation-related tests and corrosion tests describe different aspects of the oil. Demulsibility, air release and foaming results also have distinct roles. Compare like methods and relevant baselines rather than choosing the most attractive single number.
Look for a trend before making a maintenance decision.
Retain sampling dates, operating hours, top-up history and maintenance events. Review trends with qualified technical support and the equipment guidance. This guide does not set universal oil rejection limits or a drain interval for every lubricant.
KEEP THE CONTEXT WITH THE NUMBERS
A practical reference for your review.
| Review item | What it tells you | How to use it |
|---|---|---|
| Viscosity | Flow behavior at a stated temperature | Compare the same temperature, method and grade. |
| Viscosity index | How viscosity responds to temperature | It is not an overall lubricant quality score. |
| Water and particles | Contamination in the sampled oil | Keep the sampling point, equipment and trend with the result. |
| Acid or base number | Different aspects of oil condition | Interpret by oil type, method and baseline; do not use them interchangeably. |
| Foaming / air release | Different aspects of oil and air behavior | Compare the stated test, not a general “anti-foam” description. |
| Demulsibility | Oil and water separation under a test | Keep the test conditions and application with the comparison. |
| Flash or pour point | Separate test properties | Neither is a universal operating-temperature limit. |
| Corrosion or wear test | A result under specified laboratory conditions | Do not treat one result as proof of every materials or field requirement. |
RELATED PRODUCTS & READING
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