A new motor oil - AZMOL GARANT M-4042 VT - was developed for two-and four-cycle heavy-duty, heavily loaded diesel engines. A distinctive feature of this oil is the complex zinc-and barium-containing additives of the dithiophosphate type it contains - MASMA-1606, which ensured high lubricant and antioxidant properties. The oil was approved for production and use after testing with positive results. Ukraine specifications were developed for the oil: TU U 23.2-00152365-229:2006.