Has the vehicle's VIN (chassis number) been polished or altered?
We will carefully check if the chassis number on the windshield, chassis, and door frame matches.
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We will carefully check if the chassis number on the windshield, chassis, and door frame matches.
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).
Do not use a high-pressure water gun directly! The high-pressure water can instantly damage the fragile aluminum fins of the condenser, leading to a permanent decrease in cooling efficiency. We can only use a low-pressure air gun or a soft brush for surface cleaning.