Dear friend, first of all, I am very sorry for giving you a bad experience. I need to explain the problem you described: 1. This is a second-hand machine, so a small part of the pipeline oil leakage is within a reasonable range. In addition, after we learned about your problem, we actively reissued the whole car's seal ring and a complete set of track plate accessories for you free of charge. 2. Regarding the mud stains you showed, the bottom of this machine originally had no fenders, and he was engaged in engineering work. It is normal to have mud stains, and it will not cause great damage to the machine. We have already deep cleaned the machine before delivery, but because the part you showed is at the bottom of the excavator, it cannot be cleaned well, so there will be mud stains left, I am very sorry for this. 3. We shot a complete and detailed inspection video for you before delivery, and only sent the machine to you after getting your approval and consent.