FIELD: organic chemistry. SUBSTANCE: fuel addition agent has, wt.-% 2,6-di-tert.-butyl-4-methylphenol 20-70; nitrogen- or sulfur-containing derivative of protected phenol of the formula (I) 
, or (II) 
, or (III) 
where X X = -C(CH3)3 4.65-20.0, and organic solvent up to 100. Mass ratio of 2,6-di-tert.-butyl-4-methylphenol nitrogen- or sulfur-containing derivative of protected phenol (1-15):1. EFFECT: enhanced quality of addition agent. 3 tbl
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