Dalian Zhongyuan Purification Engineering Co., Ltd.'s comprehensive solution for marine oil: marine waste engine oil is filtered and purified before reuse, which can save 30% to 50% of engine oil. Practice has found that the quality of treated waste engine oil is similar to that of standard oil of the same brand: the oil change cycle for the main engine, auxiliary engine, gearbox, and tailpipe is the same. After testing two 6135G diesel engines and working for 3000 hours, the wear clearance between the crankshaft connecting rod journal and the connecting head bearing hole was 0.192mm using the same brand of standard oil and 0.206mm using treated oil. The reuse of marine waste engine oil has a good lubricating effect on the main engine, auxiliary engine, gearbox, and tail shaft pipe components, and is an effective fuel saving method.