We repeatedly confirm and emphasize to buyers before sale: after leaving mainland China, most Chinese smart electric vehicle ecosystems (such as cloud voice assistants, online maps, OTA updates) will be permanently offline. You are purchasing a hardware platform with excellent mechanical quality and a three-electric system; please use it as a "standalone" vehicle. Do not trust false promises from other channels claiming "perfect overseas unlocking and continuous official OTA updates."

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.

A structured live video inspection can catch most mechanical problems. Ask the seller to do the following in order: Cold start: film the engine bay before starting — check for leaks, cracked hoses, and corrosion. Then start from cold and listen for rattling or knocking during the first minute; abnormal noises on cold start often mean worn internals. Fluids: pull the oil dipstick — milky or foamy oil suggests head gasket issues. Check coolant color and level. Transmission: with the car warmed up, film each gear shift, forward and reverse. Hesitation, harsh jerks, or slipping RPM are red flags. Brakes: test at low speed in a safe area — the pedal should feel firm, not spongy, and the car must not pull to one side. Tires: walk around and film each tire's sidewall and tread. Uneven wear suggests alignment or suspension problems. Combine this with an independent pre-shipment inspection for a professional report — the video call is your first filter, not the final verdict.