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).

If the delays are due to policy-related force majeure like customs system upgrades, or if our documentation errors lead to short shipments, all additional demurrage and storage fees incurred at ports within China will be borne by sellwellauto, and the buyer will not have to pay a cent.

Yes. We will apply to customs or the trade promotion agency for a specific version of the certificate of origin (such as ASEAN Form E, China-ASEAN FTA certificate, etc.) to assist you in legally enjoying significant or even zero tariff treatment at the destination port.