Engine oil contamination (Mitsubishi Lancer 3)

Depending on the operating conditions, different requirements are imposed on motor oils. Therefore, it is very difficult to accurately determine the different operating conditions by their effect on lubricants. Engines that operate for a long time at high speeds or at full load develop very high oil temperatures. Under the influence of high temperatures and atmospheric oxygen, the process of oil oxidation begins. Oxidation products thicken the oil and can be deposited as paint coatings on the upper parts of the pistons, in the piston ring grooves and on the valve stems. This can lead to coking of the valve plates.

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