For B2B large customer orders, a "sampling + full inspection" dual regulation is adopted. Core parameters (no major accidents, no water damage or fire) are subject to 100% inspection per vehicle; appearance and condition are uniformly graded (e.g., uniformly purchasing Grade A), and panoramic images of all vehicles in the batch along with a core indicators comparison list are provided before shipment.

For gasoline cars, insist on a compression test: each cylinder should read within 10-15% of the others, and the actual values should match factory specs for that engine. A single low cylinder points to worn rings or valve problems that idle checks will never reveal. A leak-down test goes further. It pressurizes each cylinder and measures how much air escapes and where. Air hissing from the oil filler cap means ring wear; from the intake or exhaust means valve issues; bubbles in the radiator coolant mean a head gasket problem. This is the single most revealing test for engine condition. Also request OBD scan data with freeze-frame records, a coolant system pressure test (to catch hidden leaks), and an inspection of the timing belt or chain condition with service history. For electric vehicles, compression tests don't apply — instead ask for a battery health report from the BMS, motor insulation readings, and a road test logging any inverter or drive-unit fault codes. A written report with photos or video of each test is essential evidence for your records.

Most Chinese brands provide owner manuals in Chinese only, but you can usually get an English version through three channels: ask the exporter (many keep PDF copies), download from the brand's overseas website, or use the car's built-in infotainment system which is often switchable to English. For parts, start with the VIN. Send it to the exporter and ask for the OEM part numbers you need — many parts are shared across models sold domestically and abroad. Common wear items (filters, brake pads, suspension components) are increasingly stocked by international parts platforms and can be shipped within days. For body panels and brand-specific electronics, ordering directly from China via the exporter is often the only option, so factor a 2–6 week wait into your planning. Practical tip: before buying, ask the exporter for a parts price list for the specific model. If they cannot supply one, that is a warning sign about after-sales support. Keep a small stock of common consumables in advance to avoid downtime.