What is the viscosity of motor oil, and how does it affect engine performance
The main task of motor oil is to provideminimum friction of moving parts of the engine. Since the motors of cars operate over a very wide range of temperatures, it is not possible to create a lubricant that would ensure optimum operation under any operating conditions. Because the engine manufacturersdetermine the most suitable brands of oils,which provide the maximum possible efficiency with the minimum possible wear of parts in certain operating conditions of the motor. There is a division of lubricants into "summer" and "winter", which differ primarily viscosity.
To put it more simply, the viscosity of the engine oilcharacterizes its ability to remain on the surface of the part while maintaining fluidity. This quantity is variable and depends on temperature. Properly selected viscosity of the engine oil can prolong the life of the motor. Incorrect selection of the lubricant leads to premature engine wear. In order that it was possible somehoworiented in the range of lubricants, a classification was developed. According to the Russian GOST all they are divided into:
For all grades, the kinematic viscosity at a temperature of 100aboutC, and for all-weather and winter even at -18aboutC. In most countries of the world, the SAE classification, developed by the American Society of Auto Engineers, has been adopted.
It is believed that the higher the high-temperatureviscosity of motor oil, the better. This is not true. And although for sports cars it is recommended to apply a high viscosity index of engine oil, this does not mean that, in the bay of your engine, a viscous lubricant, you will make from a standard sports car a supercar. The motor will not work better. There will be all the opposite: the engine will quickly lose power and will require major repairs, and even replacements.
The service book lists the most appropriatefor your motor engine oil viscosity. In determining this parameter, manufacturers took into account all possible modes of operation of the motor and all its speed modes. Because there are indicated the most optimal viscosity parameters.
Use of oils with high or lowthe viscosity index is detrimental to the motor. At low viscosity, the motor can jam, and at a high index it constantly works at elevated temperatures (due to increased friction), which accelerates wear. In addition, high temperatures contribute to the rapid oxidation of oil, and therefore, it needs to be changed more often. The use of a high viscosity lubricant will not affect the operation of the motor as soon as possible. But what will happen is absolutely certain. Therefore, at STO, ask to fill in oil according to the manufacturer's recommendations, regardless of what the workers say to you: it is advantageous for them to repair their car as often as possible after the warranty period. Take care of your car yourself.
Modern brands of motor oils retainoperational properties for 500-2000 hours of operation of the engine, which is 12-45 thousand kilometers of run. Replacement of the lubricant should occur simultaneously with the change of filters and maintenance of the car. In this case, a long-term high-quality engine operation will be ensured (provided that the brand recommended by the manufacturer is used).