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).

Battery condition is the single biggest value factor in a used EV, and it can be measured — do not accept a verbal "battery is fine" without data. First, ask for a battery health certificate: brands like BYD, NIO, XPeng and Li Auto can generate an official state-of-health report from the VIN, usually within minutes at a dealer or via the brand's app. Look for SOH above 85% for a car under five years old. Second, request a charge-and-discharge test during inspection: the displayed range at 100% charge compared with the original rated range gives a practical health estimate. Third, check battery warranty status. Most Chinese brands offer 8 years or 150,000–200,000 km on the battery pack, and the remaining warranty usually transfers with the car — get this in writing. Fourth, for cars heading to hot climates, confirm the battery cooling system works; overheating is a common killer of battery life. Add a minimum SOH guarantee to your purchase contract so you have recourse if the battery underperforms.

Start by checking the after-sales clause in your contract—reputable exporters typically offer 3-12 months of parts support. The usual process: send the exporter a fault description with photos or a short video, plus your VIN and contract number. They will confirm whether it is a warranty case or a paid parts order. For warranty claims, common resolutions are free parts shipped with your next container, or a credit/refund for parts you source locally. Keep all communication in writing. To avoid long waits, ask for the OE part numbers in advance and check whether local dealers stock the same components—many Chinese brands share suppliers. Ordering common wear parts (filters, brake pads) together with the car shipment is the cheapest option by far.