Under normal conditions, the acceptable moisture content in lubricating oil is below 0.03%. However, once the water content exceeds 0.1%, the performance of additives such as antioxidants and detergent dispersants begins to degrade. This leads to accelerated oxidation of the oil. The organic acids formed during this oxidation process can react with acidic oxides from engine exhaust gases in the presence of water, forming mineral acids. These acids increase engine corrosion, leading to serious damage over time.
When oil contains excessive moisture, its lubricity decreases, viscosity drops, and the oil deteriorates prematurely. This can result in rusting of engine components and even severe mechanical failures like engine seizing or bearing burnout. To prevent such issues, it's crucial to avoid using oil with high moisture content and to detect any water contamination early.
In practice, there are several simple methods you can use to check for excessive water in the oil:
1. **Color Test**
Clean, standard oil is typically clear and translucent. If the oil appears cloudy or develops a milky white appearance with foam after the engine has been running, it may indicate water contamination.
2. **Combustion Test**
Place a copper mesh into the oil and heat it. If you hear a "click" sound, it suggests the presence of water. Alternatively, you can pour a small amount of the oil into a test tube and heat it. When the temperature approaches 80–100°C, a similar "click" sound indicates water content.
3. **Water Separation Test**
After turning off the engine, let it sit for about 30 minutes. Then, remove the oil drain plug. If water comes out, it’s a clear sign that the oil contains excessive moisture.
Regular monitoring of oil condition is essential to ensure engine longevity and optimal performance. Taking these simple steps can help identify water contamination early and prevent costly repairs. Always refer to manufacturer guidelines and perform routine maintenance to keep your engine running smoothly.
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