FIELD: chemistry, more particularly preparation of addition agents to lubricating oils. SUBSTANCE: method comprises condensing monoethanol amine with mixture of oleate, palmitate and mirystate of cholesterin (ratio is 2: 1: 1) at 120-140 C. EFFECT: preparation of addition agent by ecologically pure process, no sewage nor outbursts into atmosphere. 9 ex, 2 tbl
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