Lacquer-forming properties of motor oil under high-temperature conditions
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A new method has been developed for assessing the lacquer-forming properties of motor oils with dynamic thin-layer oxidation at high (250–370°C) temperatures. The method makes it possible to:
clearly differentiate base oils;
assess the effectiveness of additives;
select the optimal additive concentration for combined use;
assess the compatiability of additives in the case of joint use.
Tests on oils and additives in the Sliding Ring device have established the following.
Different additives display different patterns of behavior in the same base oil. With increasing concentration of the additive in the oil, the lacquer-forming capacity of the later may:
first decrease, then increase;
4) first increase, then decrease.
Depending on the quality of the base oil, the effectiveness of the same oil in it may vary by a factor of 2–3.
KeywordsOxidation Additive Concentration Ring Device Optimal Additive Concentration
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