Additives, consisting of the reaction products of 1,3,4-thiadiazolidine-2,5-dithione with hydrogen peroxide and tert-nonanethiol, containing by weight:
- 70 % or more of 2,5-bis(tert-nonyldithio)-[1,3,4]-thiadiazole (CAS RN 89347-09-1), and
- 10 % or more of 5-(tert-nonyldithio)-1,3,4-thiadiazole-2(3H)-thione (CAS RN 97503-12-3),
for use in the manufacture of blends of additives for lubricating oils

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