Dear customers, Thank you for your valuable feedback. We are always committed to providing cost-effective products that meet the description, and we are deeply concerned about your experience. After verification, the product page clearly states that the OEM technical standards are used from the original domestic parts and the shortcomings of the product itself are improved. We understand your expectations for "products". About quality concerns: We provide a 12-month working condition inspection warranty, but have not received your fault report or inspection application. Please submit a third-party inspection report through the official channel. If it is confirmed that the product itself has a quality problem, please let us know after sales to handle the problem for you We regret to note that you did not use the engine in your description and did not find or detect any fault reports. Regarding the evaluation, we do attach great importance to it, but we hope that you will evaluate it