A realistic timeline: sourcing and negotiation 3-7 days; deposit and booking 1-2 days; pre-shipment inspection 2-4 days; export clearance and vessel booking 7-14 days; sea freight 2-5 weeks depending on destination; import customs clearance and port release 5-10 days. Overall, plan for roughly 5-8 weeks from order to port of destination by sea. For Central Asia and Russia by rail, 2-3 weeks total is common. Tips: ask the exporter for a written schedule with milestones (inspection done, customs cleared, vessel loaded, ETA); track the vessel yourself once you have the container or booking number; and remember Chinese holidays — Chinese New Year and Golden Week can add 1-2 weeks of delay.

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).

4S dealership records are directly connected to the manufacturer's database, making the data hard to tamper with and the most reliable, with original parts guaranteed; third-party repair shops usually are not connected, making their data unverifiable. Therefore, we only consider the connected records from 4S dealerships as valid historical documentation.