Motor motors and their application

Depending on the operating conditions, different requirements are imposed on engine oils. Therefore, it is very difficult to accurately select a lubricant according to its action for various operating conditions. Engines that have been running at high speeds or at full load for a long time have high oil temperatures. Under the influence of high temperatures and atmospheric oxygen, the oil begins to oxidize. Oxidation products thicken the oil and can deposit a varnish-like coating on the top of the piston, in the grooves of the piston rings and on the valve stems. This can lead to sticking of the valve disc.

When the cylinders are too rich, the engine will very rarely or never give full power and you will drive with a supercooled engine (city traffic), there will be no complete combustion of the combustible mixture, and as a result, the formation of oil soot and other products will occur. Unburned fuel and condensate itself lead to the formation of slag (draft) and acids. Unburned fuel is deposited on the cold walls of the cylinders and enters the crankcase, and the oil film on the cylinder and piston is washed off.

Since some of the fuel dissolves in the oil during start-up, especially in winter (many cold starts - high percentage of fuel in oil), with a significant dilution of the oil, it is necessary to replace it ahead of time.

Depending on the temperature, any oil tends to decrease in viscosity with increasing heat, it becomes low-viscosity, as a result of which the adhesive ability and compressive strength of the lubricating film deteriorate. In the cold, the oil becomes thick and viscous, and the fluidity decreases, and the internal friction resistance increases. This property is necessary for the use of engine oil, the fluidity of which would change little at variable temperatures.

When the engine is cold, it is necessary that the oil be sufficiently low in viscosity so that it does not impede the operation of the starter and that the oil enters all lubrication points as quickly as possible, starting from the start of the engine.