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.

Odors are difficult to convey through images, so our quality inspectors conduct subjective smell assessments and record them. For vehicles with severe smoke or mold odors, if deep ozone sterilization is ineffective, we will downgrade the vehicle and mark the report with a red "Odor Warning" at the top.