PLASTIC LUBRICATION .'- m1I P P 51 ^ PGG? TPZ1 ?, and; 1d 6au; ii: riua1 The invention relates to the protection of petroleum products from microbiological damage. mercury, copper, tin, zinc, such as naphthenates and phenols. However, the known lubricants are expensive, are toxic to humans and are not effective enough. The purpose of the invention is to increase the biological stability of the lubricant - it is achieved by combining selenocyanates of the general formula SeCN10, where R is NOs, CX, COOCH3, COCH3, preferably in an amount of 0.001-0.01 wt. . The introduction of indicated quantities of selenocyanates does not affect the properties of lubricants. The table shows the results of tests of petroleum products into which various inhibitors are introduced.