With all the efforts to improve the OPEL KADETT D with the help of technical measures and increase its service life, operational safety and economy, the lubrication and maintenance of the car remains the main aspect.
Depending on the operating conditions, different requirements are imposed on engine oils. Therefore, it is very difficult to accurately determine the effect on a lubricant of various operating conditions. Engines running for long periods of time at high speeds or under full load will reach high oil temperatures.
Under the influence of high temperatures and oxygen, the oil begins to oxidize. Oxidation products thicken the oil and can accumulate on piston tops, piston ring grooves and valve stems. This can lead to the formation of carbon deposits on the valve head. If the cylinders receive a mixture in which there is little fuel, then the engine will very rarely work at full power. If you drive with a cold engine (city traffic), the consequence is incomplete combustion. Soot, oil deposits and the unburned fuel itself lead to the formation of dirt, acid and asphalt. Unburned fuel settles on the cold walls of the cylinder and flows into the crankcase, while the oil film is washed off the cylinder and piston. The consequences are a decrease in lubrication and dilution of the oil, which has a negative effect. If the oil dilution is very high, change the oil prematurely. For long trips (hot engine) part of the gasoline evaporates from the oil, especially in winter (a lot of cold alcohols high gasoline content in the oil) the condition of the oil should be checked more often.
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