Which oil is the cleanest?

Among numerous engine oil brands, those with outstanding cleaning performance include Shell Helix Ultra series, Mobil 1 Silver 5W-30 SP fully synthetic engine oil, and ERG engine oil. Additionally, Castrol Edge series breaks down sludge via special additives, and Total Quartz 9000 reduces pollutant accumulation with its antioxidant properties. When choosing, consider vehicle operating conditions: for frequent start-stop urban driving, low-viscosity fully synthetic oil (such as 0W-20) is recommended to enhance low-temperature cleaning performance, while for high-speed long-distance driving, 5W-40 viscosity with superior high-temperature stability is advised. Note that the SP grade is the current highest quality standard, which better meets the requirements of turbocharged engines, and regular replacement (recommended every 5,000 to 10,000 kilometres) is crucial for maintaining cleaning effectiveness.