The biological products and isolates of native oil cultures-destructors efficiency, 2002. Within 30 days under the biological preparations influence from 24,8 to 76,3 % of oil products decayed. From the isolates a little bit more active was isolate 2-18, excreted in 2002 in Saratov city on an overflow place; under its influence 45,9 % of hydrocarbons decayed. We are sending you an extract from the laboratory researches report on the petrooxidizing microorganisms preparations. DEVOROIL has shown one of the best results. The preparation action was so effective, that the result could be observed even visually. We hope for the further cooperation.