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Used Oil Sampling

Used Oil Sampling

Used oil sampling is a method of collecting a volume of fluid from lubricated or hydraulic machinery for the purpose of oil analysis. When collecting a used oil sample, it is highly important to make sure that procedures are used to minimize sample disturbance during and after the sampling process. Used oil samples are usually taken into a small, clear and clean bottle which is sealed and sent to a laboratory for analysis.

Proper oil sampling is critical for maintaining an effective oil analysis program. Oil analysis is pointless without a representative sample. There are two major goals in obtaining a representative used oil sample; one to maximize data density. Other is to minimize data disturbance. It is mandatory to make sure that the sample does not become contaminated during the sampling process, otherwise end up in disturb and distort data.

For best results, we suggest the following procedure and precautions when taking the sample.

The sample should be taken not more than 30 minutes after shutdown.


  •   Ensure equipment information label/sticker is filled out correctly and completely.
  •   Remove sticky back and apply to the sample bottle.
  •   Bring oil to be sampled to operating temperature. This will assure that the insoluble and semi-soluble material is suspended evenly throughout the system.
  • Always sample from the upstream of filters and downstream of machine components to ensure that no data like particles is being removed by filters or separators. Insert supplied tubing through top of pump until approximately 10 mm protrudes into bottle space and tighten tube nut with finger pressure. Screw bottle on pump firmly.
  • Take care to remove all dirt and contaminants from compartment opening.
  • Take care with HOT compartments, especially engines and PRESSURISED hydraulic systems.
  • Insert tubing to within 50 to 100 mm from bottom of compartment being sampled.
  • Operate sampling pump until bottle is ¾ full. Stop oil flow by loosening bottle to break the vacuum.
  • Remove bottle and recap immediately, make sure no contaminants enter the bottle.
  • Discard sampling tube in a thoughtful manner, clean up any spillage with clean rags.
  • Mail or forward samples immediately to Techenomics Laboratory.

NOTE: If sampling pump should become contaminated, disassemble pump, flush with clean solvent and dry thoroughly. DO NOT use petrol or diesel to clean pumps.


Used Oil sampling – how and why it should be done

Oil Sampling

There are two intervals for effective sampling:

  • During servicing
  • Prior to servicing


Please ensure these points are organised before sampling:

  • Sample location
  • Person in charge
  • Method of sampling
  • Safety requirements
  • Tools
  • Sample bottle and label
  • Transportation to laboratory


  1. From Oil Valve Probe (live sampling)

Using vacuum pump extraction.

  1. From Oil Valve Probe:
  • With engine in low idle, open clap.
  • Fit tube hose onto clap, take a 100 ml sample and drain.
  • Fit tubing again and extract sufficient oil to three-quarters fill the bottle.
  • Close bottle and fill in the label. Closely follow the instructions on the label.

  1. Using vacuum extraction:
  • Stop engine, cut hose tubing to approximately 1 metre.
  • Put bottle on vacuum pump and tighten it.
  • Take sample until bottle is three-quarters full.
  • Oil must be at operational temperature – do not take the sample cold.

Do not take the sample from the oil drain or from the oil drain pail.

How to complete label:

Send oil sample as soon as possible to laboratory for analysis.

Contact Techenomics laboratory on +61-2-65712699

Contact Techenomics Technical Staff on +61-2-65712699

News release – oil sampling

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