SUMMARY
The used-oil analysis program describes the condition of the oil in service. It is used to determine the suitability of the lubricant for continuing service and optimum intervals for preventive maintenance activities. Decisions regarding maintenance requirements and oil change intervals should be made based on trends, not on the results of one sample. The first step in the program is to determine which equipment should be monitored and which tests will give the most useful information for the application. If improper sampling or test- ing procedures are used, the results can be misleading. The used-oil analysis program is a useful technique if implemented properly. It is a significant contribution to the overall success of the maintenance program.