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).

This is a key legal issue. If the inspection is conducted by a third party appointed by us, we will be the primary responsible party and provide limited compensation to you, after which we will seek reimbursement from the inspection agency; if the inspection agency is designated by you personally (such as SGS), you will need to file a claim directly with that agency according to its service terms.

We will directly check the registration certificate (the big green book) and count the number of changes.