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).

100% guaranteed. This is the legal prerequisite for the export of used cars allowed by Chinese customs and the Ministry of Commerce. Any vehicle with unresolved traffic violations (fines/demerits) cannot complete the deregistration process at the traffic management bureau, and therefore cannot obtain a legal export license.

The headliner is considered an "irreversible interior component." If the edges are delaminated or there are deep, hard-to-clean dark water stains, it will directly lead to a downgrade in the interior grade, even if it does not affect driving. We will not use pins or low-quality glue for cosmetic repairs.