We use two steps: 1. Insert a medical-grade endoscope through the spark plug hole to visually inspect cylinder wall scratches and carbon buildup on the piston top; 2. Extract an engine oil sample to check for large metal debris or emulsification (caused by coolant leakage).

The platform has strict internal outbound inspections. If buyers need, we can assist you in commissioning an independent third-party evaluation agency (such as Cha Doctor, Dongche Di official testing, etc.) for re-inspection, with costs borne by the buyer. An independent report can provide more credibility for your local resale.

Absolutely not. The aging and cracking of rubber parts are inevitable over time and are a normal manifestation of vehicle depreciation. Our compensation only covers sudden and catastrophic mechanical failures, such as engine cylinder scoring or transmission gear breakage.