How to choose engine oil correctly[汽车修理知识]

1. Engine oil composition: It is composed of base oil and additives.The base oil is mostly mineral oil, and the additives are metal detergents and antioxidants.Anticorrosive, Rust remover, ashless dispersant and viscosity index improver, etc.
2. Choose according to the use regulations: should be based oncarFor the working conditions of the engine, select the appropriate oil type and use level.
3. Selection according to regional seasonal temperature: The selection of oil should be based on the regional seasonal temperature, combined with the performance and technical conditions of the engine, and the appropriate oil label and viscosity grade should be selected.
4. Select the appropriate viscosity: The viscosity of the oil should be as small as possible, but it must be determined according to the local temperature and car class. The engine oil for medium and high-end cars must be selected according to the manufacturer's information and guidelines, not arbitrarily selected.
5. Gasoline engine oil cannot be used in diesel engines: special gasoline engine oil cannot be used instead of diesel engine oil to avoid accelerating the wear and tear of the diesel engine. In principle, gasoline engine oil and diesel engine oil should be used separately.
6. Use multi-grade oil as much as possible: Multi-grade oil has good viscosity-temperature performance, can be used in the engine for a long time, saves fuel, and is universal in all seasons and is easy to manage. When using multi-grade oil, the oil color tends to turn black and the oil pressure is lower than ordinary oil. These are normal phenomena.
7. Timely oil change: If possible, change the oil according to the quality; if there is no condition, change the oil according to the recommended oil change mileage in the instruction manual or the oil change specified by the vehicle model. Do not mix oils of different specifications and different manufacturers.
8. Maintain proper oil volume: must be maintainedCrankshaftThe tank has enough oil. Too little oil will cause the parts to burn out and accelerate the deterioration of the oil.If the oil level is too high, it will flow from the cylinderpistonBleeing into the combustion chamber in the gap increases the carbon deposits in the combustion chamber.
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