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Caterpillar has developed a maintenance management tool that evaluates oil degradation and detects the early signs of wear on internal components. The Caterpillar tool for oil analysis is called S O S oil analysis and the tool is part of the S O S Services program. S O S oil analysis divides oil analysis into four categories:
Component wear rate
Oil condition
Oil contamination
Oil identificationComponent Wear Rate analysis evaluates the wear that is taking place inside the lubricated compartment. The S O S Services analyst uses the results of elemental analysis and particle count tests to evaluate the wear. Trend analysis and proprietary wear tables are then used to determine if wear rates are normal or abnormal.Oil Condition analysis is used to determine if the oil has degraded. Tests are done to look at the oxidation, sulfation, and viscosity of the oil. The S O S Services analyst uses established guidelines or trend analysis to determine if the oil has reached the end of its useful life.Oil Contamination tests are performed to determine if anything harmful has entered the oil. This analysis relies on the results from the following tests: elemental analysis, soot, particle count, fuel dilution, water, and glycol. The S O S Services program has guidelines for the levels of contamination that are allowed in Cat engines.Oil Identification is another very important part of the S O S oil analysis program. The wrong oil in an engine can severely damage major components. The S O S Services analyst uses elemental analysis and viscosity results to identify key characteristics of the oils.These four types of analysis are used to monitor the condition of your equipment, and to help you identify potential problems. A properly administered S O S Services oil analysis program will reduce repair costs and the program will lessen the impact of downtime.The S O S oil analysis program uses a wide range of tests to determine the condition of the oil and the condition of the lubricated compartment.Guidelines that are based on experience and a correlation to failures have been established for these tests. See the following chart for the guidelines. Exceeding one or more of these guidelines could indicate serious fluid degradation or a pending component failure. A trained person at your Caterpillar dealership should make the final analysis.Note: Cooling system problems will also reduce the life of engines. S O S coolant analysis together with S O S oil analysis provide a complete and accurate method for monitoring the health of all engine systems. Refer to the S O S Services coolant analysis information in this publication. A properly administered S O S Services program will reduce repair costs and lessen the impact of downtime.
Table 1
S O S Oil Analysis Guidelines    
Test Parameter     Guideline    
Oxidation     (1)    
Soot     (1)    
Sulfation     (1)    
Wear Metals     Trend Analysis and Cat Wear Table (1) norms    
Water     0.5% maximum    
Glycol     0%    
Fuel