TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (C1) comprises (wt.%): phosphorus content (0.001-0.5 or 0.01-0.12 (preferably 0.05-0.12, especially 0.01-0.08) wt.%) derived from zinc dialkyldithiophosphate compound; sulfated ash content (2), biodiesel fuel or decomposition products (0.3-20) and diarylamine compound (0.4) and further comprises at least one additive selected from antioxidants, antiwear agents, detergents, rust inhibitors, demulsifiers, and friction modifiers, multi-functional additives, viscosity index improvers, pour point depressants, foam inhibitors, metal deactivators, dispersants, corrosion inhibitors, lubricity improvers, thermal stability improvers, anti-haze additives, icing inhibitors, dyes, markers, static dissipaters and/or biocides (preferably antiwear agent comprising a zinc dialkyl dithiophosphate compound). Preferred Components: The biodiesel fuel comprises an alkyl ester of a long chain 12-30C fatty acid. The base oil has a kinematic viscosity 4-20 cSt at 100 degrees C. The diarylamine compound is a diphenylamine compound (preferably 1-20C alkylated diphenylamine, especially bis-nonylated diphenylamine, bis-octylated diphenylamine and/or octylated/butylated diphenylamine). EXAMPLE - A lubricating oil composition (test) comprising (wt.%): IRGANOX L-57 (RTM: an octylated/butylated diphenylamine) (1), ethylene carbonate post-treated polyisobutenyl succinimide (1.1), borated succinimide (2.5), high molecular weight polysuccinimide (1.8), calcium sulfonate detergent (0.18), borated calcium sulfonate (0.27), M-400T (RTM: magnesium sulfonate) (0.24), calcium phenate detergent (0.65), zinc dialkyldithiophosphate (1.1), polyacrylate pour point depressant (0.3), silicon of a foam inhibitor (5 ppm) and ethylene-propylene copolymer (6.5) in a base oil which was a mixture of a hydroprocessed 600 neutral base oil (14 wt.%) and Group II base oil (86) was prepared. A comparative lubricating oil composition comprising (wt.%): a conventional ultra low sulfur diesel fuel (6), ethylene carbonate post-treated polyisobutenyl succinimide (1.1), borated succinimide (2.5), polysuccinimide (1.8), calcium sulfonate detergent (0.18), borated calcium sulfonate (0.27), magnesium sulfonate (0.24), calcium phenate detergent (0.65), zinc dialkyldithiophosphate (1.1), polyacrylate pour point depressant (0.3), silicon of a foam inhibitor (5 ppm) and ethylene-propylene copolymer (6.5) in a base oil which was a mixture of a hydroprocessed 600 neutral base oil (14 wt.%) and Group II base oil (86) was also prepared. The oxidation property of both the composition was determined. The oxygen uptakes (hour) shown by test/comparative was 60.1/2.8 hours respectively.