After the engine oil has been used for a period of time, due to the infiltration of external impurities and oxidation reaction, the oil gradually loses its lubrication performance and must be replaced in time (the oil change cycle is specified in the diesel engine manual). In the following cases, due to the poor working conditions of the engine, the drain interval must be shortened. 1. Vehicles that drive on roads with a lot of dust and sand, and diesel engines that operate in dusty environments (such as threshing, rice milling, milling, feed crushing, etc.), have more dust passing through the air filter into the cylinder. The wear of the diesel engine is exacerbated and these impurities enter the oil pan to contaminate the engine oil. 2. In diesel engines that often operate in humid environments (such as pumping water), water droplets are easily condensed in the crankcase, and water droplets permeate the engine oil to make the engine oil easily emulsified. 3. Diesel engines often operate under small throttles and light loads. Diesel fuel cannot be fully atomized and burned. It is easy to flow into the oil pan from the cylinder wall and dilute the oil. 4. In a diesel engine operating in a severely cold area, the diesel oil in the cylinder is also easily condensed and mixed into the engine oil to reduce the lubrication effect of the engine oil. 5. Diesel engines that are frequently operating in coastal areas have higher corrosion rates due to the higher concentration of water vapor in the air, corrosion of diesel engine parts, and deterioration of engine oil. 6. Diesel engines that often operate under full load or overload conditions (such as broken stones) have high engine temperatures and high carbon deposits, and oils are easily oxidized and deteriorated. 7. During the running-in period of the new or overhauled diesel engine, the mechanical impurities in the engine oil increase due to friction and wear, and the oil must be changed earlier. 8. Before the technical state of the diesel engine deteriorates or is overhauled, due to the excessive clearance of the relevant parts in the cylinder, the diesel engine will burn badly and the carbon deposition will increase. The high-temperature exhaust gas will lead people to the crankcase, causing the engine oil to deteriorate. In addition, when the diesel engine is exposed to diesel oil, cooling water seeps into the oil sump, or an accident of burning and holding the shaft occurs, the oil must be replaced in time and the lubricating oil path must be cleaned.
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