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For gasoline engines:
High speed: low viscosity oil. Choose from 0W20, 5W30, 10W40
Fuel saving target: oil has a lower coefficient of friction
Lubricants must maintain viscosity for continuous lubrication, rust protection, chemical corrosion resistance and especially high dispersion and enhanced dispersion additives.
For diesel engine:
Operating under high load, low speed conditions. Choose high viscosity 15W40, 20W50.
The fuel has a high sulfur content, so when burning, they form Sox => strong acid => corrosive and degenerate => require a much higher amount of detergent (soap, alkaline) gasoline engine times.