Diesel generator sets generally need to change the oil once after 500 hours of operation. However, sometimes the replacement period is not reached, or the oil becomes thinner and impurities increase before it has been used for a long time, making it impossible to continue using it. Why does diesel generator oil deteriorate too quickly? ①. The oil grade is wrong and the quality does not meet the requirements. Generally, diesel generators with supercharged speed and calibrated speed greater than 2000r/min should use CC grade or above oil; ②. Technical status of diesel engine generators Not good, air blow-by, oil blow-by, fitting gap is too large or oil temperature is too high; ③. Diesel engine generators often operate at low temperatures, low loads, and low speeds. The piston deformation is insufficient and combustion is incomplete. Diesel enters the oil pan along the cylinder wall, causing the oil to dilute and deteriorate; ④. Exhaust gas enters the oil pan and condenses into water and Acidic substances will cause the engine oil to deteriorate; ⑤. The oil filter element is dirty, and unfiltered dirty oil enters the lubricating parts, accelerating the wear of parts. ⑥. The filter element sealing ring is broken.