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).

We maintain an extremely cautious and firm denial. Some platforms may cater to such demands for orders, but converting left-hand drive to right-hand drive involves complex steering column cutting, firewall structure changes, and wiring harness reorganization. This non-factory deep modification poses significant safety risks and is very difficult to pass vehicle safety inspections in developed countries (such as Japan's earthquake test and the UK's IVA test). Out of responsibility for safety and long-term reputation, we refuse to provide any steering conversion services that damage the vehicle's underlying structure.

The lifespan of rubber sealing strips for frameless doors is usually only 4-5 years. We carefully press the sealing strip at the edge of the roof to check for loss of elasticity and use a high-pressure water gun to wash the seams of the windows to check for direct water leakage due to aging.