清洗步骤包括放掉旧油，除掉沉积物。

Cleaning steps including let off the old oil, remove sediment.

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此法可测定新油及旧油中的烟炱含量，准确性、重复性较好。

The soot content in the field test oils is measured with the fore mentioned method, which shows good accuracy and repeatability on both new and used oils.

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本文重点对使用过程中的旧油进行红外光谱测试，分析烟炱对粘度增长的影响。

This paper pay much attention to analyse the soot influence on viscosity increase, based on testing the infrared spectrum of the old being used oil.

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