Depending on the operating conditions, engine oils are subjected to frequent, changing loads. Therefore, it is very important to accurately establish the effect of various operating conditions on the lubricant. Oil reaches high temperatures in engines running for long periods of time at high speeds or under full load. Under the influence of high temperatures and atmospheric oxygen, the oil begins to oxidize. Oxidation products thicken the oil and settle in the form of a varnish-like coating on the upper parts of the pistons, in the grooves of the piston rings, on the valve stems, leading to coking of the valves.
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