Selection and use of the opcom op com oil

Appropriate viscosity oil on the engine is very important, not the number of "SAE" the bigger the better, according to the local temperature and auto level. Generally speaking, in Guangdong and other southern regions, ordinary car engine oil can choose "SAE" 30 to 40 "API" CC and CD level (Diesel) or "API" SD and SE grade (gasoline), and the high-class cars The oil must be in accordance with the manufacturers data guidelines to choose, not to arbitrarily chosen.There is also a wider multi-grade oil with a "W" indicates, add it to the high polymer material, the addition to the general characteristics of oil, its viscosity can be within a certain range the withered section, when exposed to heat thickens in case of cold thinning, thus reducing the resistance and wear of the engine. 
Oil are generally composed of two parts of the base oil and additives. Most of the base oil a mineral oil, an additive metal detergents, the antioxidant corrosion inhibitors, rust agents, ashless dispersants and viscosity index improvers and the like. Chemicals for oil to add some special features to improve the quality of oil, not only can reduce engine wear and tear to extend the life of the machine, so that the piston and combustion chamber cleaner, more lubricants Road and on the fine filter sediment and fuel economy extension of the use of replacement oil mileage, general drain intervals of up to more than ten thousand kilometers. 

In general, gasoline high speed less load, low pressure lubrication, the engine speed low load, high pressure lubrication, both oil performance requirements are different, so depending on the type of engine oil in two ways, one is called gasoline engine oil, the other is diesel engine oil, the two can not be mixed. As for the market both gasoline and general-purpose engine oil for diesel engines, and its performance to meet the overlap of the two types of engine oil level, so also marked the oil level range, and can not be applied to all cars.The oil is also a lot of stress.