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).

We maintain an absolute skeptical attitude. In addition to regular visual inspections, we focus on checking for sediment accumulation around the sunroof drainage channels and look for water stains under the A-pillar trim and front floor mats. This is the only effective physical evidence to determine if the sunroof drainage holes are blocked, leading to hidden leaks.

Compliance with the law is an absolute requirement for exports. All vehicles exported through our platform must complete the following legal processes: release all domestic bank mortgages, pay all traffic fines, and complete the formal deregistration for "transfer pending export" with the Chinese public security traffic management department. Only vehicles with 100% clear ownership can be approved for export permits.