The presence of coolant in the crankcase could lead to corrosion or damage of some sensitive parts or components of the unit, which can be observed on the elemental analysis, but the presence and severity of the contaminant can be further identified with the colorimetric analysis. The advantage of correctly understanding an oil analysis report in the case of oil contamination due coolant intrusion on internal combustion diesel engines is monitoring the performance of the unit under not ideal conditions and when to decide to activate proactive, preventive or corrective maintenance due its operation conditions. In this comparative study, we will develop more deeply the importance of these two methods used together as a complementary tool for the determination of component failure due to a coolant leak, the severity of the issue, possible solutions, and the future preventions of the issue. Each test method used individually, although important on its, own, may not tell the whole story. The combination of these two methods in oil analysis is an important tool for the verification of lubricant contamination with antifreeze in internal combustion engines. When these two very different tools are used separately, the results could potentially be inconclusive, and any action could be inaccurate with expensive and/or catastrophic consequences due to the equipment operating out of manufactured conditions. For this study, we are going to use as an example involving ASTM D2982-07 (Detecting Glycol-Base Antifreeze in Used Lubricants Oils1) together with ASTM D5185-18 (Multi-element Determination of Used and Unused lubricating Oils and Base Oils by Inductively Coupled Plasma Atomic Emission Spectroscopy ICP-AES1) on internal combustion diesel engines. One of the principal issues is the difficulty in reviewing oil analysis reports on the maintenance site when you have conflicting results in the report. Oil condition monitoring programs play a very important role in this particular matter, continuously testing a small portion of the lubricant in use for a very low cost in comparison to the value of a corrective action, such as full lubricant replacement or even more if a mechanical part or entire unit must be put down due to a breakdown. In order to keep the unit in the field, it is necessary to avoid constant failures and downtime due to corrective maintenance or in a worst-case scenario, the replacement of the unit as a consequence of a catastrophic failure. The importance of selecting the correct test to analyze the performance of a piece of equipment cannot be isolated to a specific test it requires the combination of two or more tests or a group of tests depending on the activity of the selected equipment in the production process.
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