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.Galol M-4042 TD (TU U 0015 1650.040 -97) and M-16IKhP-3 (GOST 25770) lube oils for heavy-duty two-cycle transport diesels contain nontraditional, to some degree unique, barium-containing additives which are complicated in both composition and production technology: respectively, KASP-13 [1] and IKhP-21 (TU 38.101724 -81) [2]. The former consists of barium salts of the condensation product of a mixture of alkylsalicylic acids and alkylphenols with formaldehyde and ammonia, and the latter is the barium salt of the condensation product of alkylphenol with formaldehyde and ammonia treated with phosphorus pentasulfide. These additives ensure the necessary level of performance properties, which in turn ensures the working capacity of two-and four-cycle heavily loaded transport diesels [3]. However, due to the lack of plants producing these additives, production of M-16IKhP-3 and Galol M-4042 TD oils has stopped in Ukraine.MASMA UkrNDINP GP together with AZMOL AT and Khar 'kov Design Bureau on Engine Construction (KDBE) developed a new oil for two-and four-cycle, high-speed, heavily loaded diesel engines: AZMOL GARANT M-4042 VT. One condition of developing it was to ensure a higher level of performance properties, in particular, scavenging and antiwear properties, than in Galol M-4042 TD.