TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (C1) further comprises at least one additive selected from antioxidants, antiwear agents, detergents, rust inhibitors, demulsifiers, 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. The antiwear agent comprises a zinc dialkyldithiophosphate compound. The phosphorus content derived from zinc dialkyldithiophosphate compound is 0.001-0.5 (preferably 0.01-0.12, especially 0.01-0.08, particularly 0.05-12) wt.%. The sulfated ash content of (C1) is at most 2 wt.%. The biodiesel fuel comprises an alkyl ester of 12-30C long chain fatty acid. The amount of the biodiesel fuel or its decomposition product is present in (C1) at 0.3-20 wt.%. The base oil has a kinematic viscosity of 4-20 centistokes at 100 degrees C. The metal phenate is an alkaline earth metal phenate (preferably calcium metal phenate). The metal phenate is of formula (I), (II) and/or (III). The metal phenate is at least 2 wt.%, and the amount of the metal from the metal phenate present in (C1) is at least 1500 parts per million.R1-R6=H, alkyl, aralkyl or alkylaryl (preferably alkyl);M1-M3=alkaline earth metal (preferably calcium);andn=1-3. EXAMPLE - A base-line formulation (F1) containing (wt.%) actives of an ethylene carbonate post-treated polyisobutenyl succinimide (1.1), actives of a borated succinimide (2.5), actives of high molecular weight polysuccinimide (1.8), actives of a low overbased calcium sulfonate detergent (0.18), actives of a zinc dialkyldithiophosphate (1.1), IRGANOX L-57 (RTM: octylated/butylated diphenylamine) (0.3), IRGANOX L-135 (RTM: mixture of 7-9C branched alkyl esters of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid) (0.5), sulfur-containing oxymolybdenum succinimide complex (0.2), polyacrylate pour point depressant (0.3), silicon (5 parts per million) of a foam inhibitor and non-dispersant type ethylene-propylene copolymer viscosity index improver (6.5) in a base oil which was a mixture of a Chevron Neutral Oil 600N (RTM: hydroprocessed 600 neutral base oil) (14), and Chevron Neutral Oil 220N (RTM: group II base oil) (86), was prepared. A lubricating oil composition was prepared consisting of (F1) with the addition of actives (1.45 wt.%), and calcium (2100 parts per million) of an overbased calcium phenate. Similarly a comparative was prepared using borated calcium sulfonate. Both test/comparative were evaluated for corrosion control high temperature corrosion bench test (HTCBT). Test/comparative had copper (parts per million) of 12/41.