Some industrial engines are designed to use gaseous fuels (such as natural gas). Although this type of engine is similar to a diesel engine, it has been improved so that the combustion reaction in the cylinder is started by electric sparks. This is different from a real diesel engine. Industrial diesel engines in actual use are equipped with reciprocating pistons. Diesel engines can be either two-stroke or four-stroke. According to the arrangement of cylinders, fuel engines can be divided into vertical, horizontal or with a certain inclination, such as V-shaped engines. The type of engine used in the industry depends on the requirements for engine power, weight and size. The main function of engine oil in the engine is to reduce friction, absorb frictional heat, and cool the engine.

In order to meet the design requirements of different types of engines, a series of engine oils with viscosity and quality grades have been developed. In order to reduce the formation of deposits and coke, all engine oils must have good thermal oxidation stability to extend the oil drain period. A well-designed engine oil filtration system is also closely related to the service life of the oil. In addition to reducing friction, the oil also has the function of removing metal wear particles between the fine gaps on the moving surface and keeping it clean. The products of the combustion of wear particles and fuel must remain suspended in the oil in order to be filtered out by the engine oil filter device. The operating conditions of the diesel engine are variable, including low-speed stable output, medium-speed variable output, high-speed and high-output. Because the cleanliness of the oil plays an important role in the engine, the oil must contain a detergent and dispersant. Engines with high compression ratios have a tendency to accelerate the formation of oil precipitation. Engine oil with high-definition cleanliness can keep the piston clean, reduce the rate of wear between the cylinder and the piston ring, and prolong the service life of the engine. Detergents can prevent decomposition products from depositing on piston rings, pumping paths and other components. Oil temperature has a significant effect on dispersion, and it is difficult to achieve good dispersion effect at low temperature, but for diesel engine crankcase oil with high power output, low temperature dispersion is often the most basic requirement.

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