Assuming you’ve chosen a reputable lab, if you want oil analysis results you can truly rely on, here are a few best practices to follow on your end:
1. Sample Carefully: Improper sampling is one of the most common causes of misleading results. Best practices include:
- Sample from live, circulating oil whenever possible—not from stagnant oil in a drain pan or sump bottom.
- Use dedicated sampling ports to ensure consistency.
- Avoid contamination by flushing the port and using clean, sealed bottles.[1]
- Sample during consistent operating conditions: same temperature, load, and runtime, etc. This enables reliable trend analysis.
Following proper sampling methods ensures the lab is testing oil that accurately reflects the condition of the oil.
2. Handle the Sample Correctly: To protect sample integrity:
- Keep bottles tightly sealed at all times.
- Avoid exposure to extreme temperatures.
- Prevent cross-contamination by keeping samples away from solvents, fuels, and unclean work surfaces.
- Store samples upright until shipping.
What may seem like insignificant handling errors can introduce moisture, dirt, or chemical interference that distorts test results.
3. Label Completely and Accurately: Clear, accurate labeling provides the baseline data analysts need to interpret your results correctly. Every sample should include:
- Equipment ID
- Oil type and viscosity
- Operating hours for both the oil and equipment
- The date the sample was taken
- Any recent maintenance or introduction of new oil
Without this information, labs may still run tests—but the accuracy of diagnosis and trending may be compromised.
4. Ship the Sample ASAP: Delayed shipping increases the risk of oxidation, settling, and environmental contamination. For best results:
- Ship samples within 24 hours of collection.
- Use leak-proof shipping containers.
- Do not expose the samples to temperature extremes.
Fresh samples produce the most reliable data because they capture the oil exactly as it is operating in the system, minimizing the risk of degradation or contamination that could skew analysis results.
5. Maintain Consistent Sampling Intervals: One oil sample is a snapshot. The real power of oil analysis comes from trending over time. By sampling at regular intervals:
- Wear patterns become easier to detect.
- Fluid degradation is easier to track.
- False alarms are reduced
- Maintenance decisions become more predictive and less reactive
Consistency builds confidence in both your data and your maintenance strategy.
From there, work with a reputable lab, such as Eurofins TestOil, to choose the correct test slate, ensure accurate results and deliver expert interpretation and recommendations. Together you and your lab will leverage accurate data into highly relevant maintenance decisions.
Need help taking samples? Learn more about Eurofins TestOil onsite oil sampling services: http://testoil.com/sampling-pro/. To schedule oil analysis or for more information on working with Eurofins TestOil for oil analysis, fuel analysis or training visit https://testoil.com/company/contact-us/; call 216-251-2510; or email sales@et.eurofinsus.com.
With more than 30 years of experience in the oil analysis industry, Eurofins TestOil focuses exclusively on assisting industrial facilities with reducing maintenance costs and avoiding unexpected downtime through oil and fuel analysis program implementation. As industry experts in diagnosing oil-related issues in equipment such as turbines, hydraulics, gearboxes, pumps, compressors and diesel generators, Eurofins TestOil provides customers with same-day turnaround on routine oil analysis testing.
About Eurofins – the global leader in bio-analysis
Eurofins is Testing for Life. Eurofins is the global leader in food, environment, pharmaceutical and cosmetic product testing, and in discovery pharmacology, forensics, advanced material sciences and agroscience Contract Research services. Eurofins is also a market leader in certain testing and laboratory services for genomics, and in the support of clinical studies, as well as in BioPharma Contract Development and Manufacturing. The Group also has a rapidly developing presence in highly specialised and molecular clinical diagnostic testing and in-vitro diagnostic products.
With over 61,000 staff across a network of 940 laboratories in 59 countries, Eurofins’ companies offer a portfolio of over 200,000 analytical methods. Eurofins Shares are listed on Euronext Paris Stock Exchange.
[1] Some labs, including Eurofins TestOil provide sampling supplies in many cases.
