very good
Shenyang Huizhongbao BMW Certified Pre-Owned Vehicles promises: Every vehicle undergoes rigorous screening and professional inspection! Step 1: Rigorous Screening: Vehicle age not exceeding 6 years, mileage not exceeding 120,000 kilometers. Flood-damaged and fire-damaged vehicles are rejected. Vehicles with major structural damage or deformation are rejected! Step 2: 360-degree Professional Inspection: Inspection of body structure damage, engine and related components, chassis and transmission. Step 3: Worry-Free After-Sales Service: 12-month unlimited mileage original factory warranty, 7-day worry-free return and exchange, 12-month 24-hour roadside assistance, and other value-added services!
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 typical case of "secondary damage caused by unprofessional rescue." Many hybrid vehicles require access to "maintenance mode" via engineering computers to allow the water pump to run at full speed for exhaust. We do not bear any moral or financial responsibility for cylinder damage caused by local technicians' misoperation.
As rubber seals age, "slight oil seepage (oil stains but no dripping)" is very common in used cars and is not considered a major fault. Our recommendation is: as long as the oil level does not drop abnormally, just clean and monitor it regularly after arrival, without the need to immediately incur high costs to disassemble and replace the seals.
