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).

Used cars are classified under HS heading 8703 (motor vehicles for transport of persons), with the last four digits determined by engine type and size. Gasoline cars usually fall in 8703.21–8703.80 depending on displacement; pure EVs fall under 8703.80; hybrids have their own subheadings. The duty amount depends on your country's tariff schedule: 1. Most countries charge duty on the CIF value (car price + freight + insurance), not the FOB price. 2. Many developing markets levy higher duties on used vehicles than new ones, and some add a surcharge based on age — older cars can cost significantly more to clear. 3. After duty, you typically pay VAT/GST on the CIF + duty total, plus port and customs fees. Practical tips: ask your exporter to state the exact HS code on the commercial invoice and confirm it with a local customs broker before shipping. A wrong code can trigger reclassification, penalties, or delays. Also budget for any excise tax tied to engine capacity — in several markets a 2.5L car clears far cheaper than a 3.5L one.

Once the car system (especially in a closed ecosystem) undergoes a major version upgrade, its bootloader is usually locked, preventing downgrades. If this happens, there is basically no solution in an overseas environment. Therefore, we strongly warn: do not blindly insert a USB drive to upgrade while offline.