| abstract |
(57) [Summary]nA composition comprising a lubricating oil and at least one primary antioxidant and a secondary antioxidant is disclosed, wherein the primary antioxidant is a secondary diarylamine and the secondary antioxidant is 2, 2,4-trialkyl-1,2-dihydroquinoline or a polymer thereof. A primary antioxidant which is at least one primary antioxidant and a secondary antioxidant, which is a secondary diarylamine; and a 2,2,4-trialkyl-1,2-dihydroquinoline or a polymer thereof. Also described is a method of increasing the oxidative stability of a lubricating oil, comprising adding a second antioxidant to the lubricating oil. |