S.O.S. Fluid Sampling & Analysis

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Scheduled Oil Sampling SOS 

Scheduled Oil Sampling (S.O.S.)

Scheduled Oil Sampling, or S.O.S. for short, is a WesTrac service allowing you to see what is going on inside your machine and detect problems before they become serious.

WesTrac’s in-house S.O.S. laboratory is staffed by specially Caterpillar trained technicians, experienced in Caterpillar machines and components.

For Caterpillar customers, this offers a major benefit compared to outsourcing from other external suppliers. Our WesTrac specialist technicians know exactly what metallurgical specifications were designed into each part and component.

Our team has over 48 years' experience and conducts more than 400,000 oil tests every year. If test results point to a potential problem, you will be provided with carefully outlined recommendations immediately (Available on-line via Oil Commander).

What tests are conducted?

Get Connected Are you eligible?

Caterpillar S.O.S. Services include S.O.S. oil analysis and S.O.S. coolant analysis. The standard tests in the S.O.S. oil analysis include wear rate analysis, oil cleanliness analysis, oil condition analysis and detection of fuel, water and glycol. Additional tests may be performed if needed.

Maximise Reliability

WesTrac SOS fluid analysis can provide you with an accurate account of the health of your engines, power generators and other major components. This knowledge allows you to schedule maintenance and oil changes more effectively while maintaining maximum reliability.

Extend Equipment Life

Effective preventative maintenance is estimated to be 3 to 5 times more cost-effective than unscheduled maintenance and repair. In many instances, SOS has detected the need to replace a small part, which has prevented the failure of a major component.

Surveys consistently show major benefits for users who regularly use S.O.S. Oil Analysis. A 10:1 payback ratio is common when comparing the amount saved on repair costs to the amount invested in S.O.S. Services. This figure alone is probably conservative, especially when coupled with reduced downtime, greater productivity, and increased used machine value as the analysis identifies potential problems before they become catastrophic failures and cause unplanned downtime.

Fluid analysis allows you to schedule maintenance more effectively and extend equipment life.

Interested? Send us an enquiry or call us on 1300 881 064.

Infographic: The Benefits of Fluid Sampling

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What can S.O.S. detect?

SOS LabOur in-house world class S.O.S. laboratory can evaluate more than 30 characteristics from each fluid sample, including:

  • Wear metals
  • Water
  • Fuel dilution
  • Glycol/coolant
  • Foreign particles
  • Viscosity
  • Soot and sulfur compounds
  • And more

And from each fuel sample our team of specially Caterpillar trained technicians can evaluate:

  • Contamination levels
  • Corrosion levels

How will I access the results?

Oil Sampling Lab

WesTrac’s Oil Commander is a sophisticated online service that allows you to view the results of your Scheduled Oil Sampling (S•O•S).

You can

  • track your oil sample results
  • understand sample interpretations and
  • record corrective action.


It communicates the information in a simple, visual and easy-to-understand way, highlighting potential problems so you can make informed and timely decisions.

Why Fluid Analysis Matters