Method for reducing one or more of deposits and friction of a lubricating oil

A method for improving one or more of the deposit formation or friction in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil comprising a Group IV lubricating oil base stock at greater than or equal to 77.7 wt. % and additive amounts of an essential component:

• (1) a borated hydroxyl saturated hydrocarbon ester amide-amine mixture comprising Vanlube® 289 which is a mixture of materials including:
• as well as unreacted glycerol, glycerol mono-, di- and tri-ester,
• unreacted boronating agent and unboronated
• (2) zinc dialkyl dithiophosphate;
• and (3) calcium salicylate detergent whereby the levels of deposit formation and/or of friction are improved as compared to the levels achieved using a Group IV lubricating oil containing the borated hydroxyl ester amide-amine mixture, the zinc dialkyl dithiophosphate and a calcium phenate or calcium sulfonate detergent,
• wherein the borated hydroxyl saturated hydrocarbyl ester amide-amine mixture is employed in an amount in the range of 1.0 to 2.2 wt %,
• wherein the zinc dialkyl dithiophosphate is of the formula:
• Zn[SP(S)(OR′ and R″)]2
• wherein R′ and R″ are straight or branched secondary C1 to C18 alkyl groups, present in an amount of about 0.45 wt % to contribute about 460 to 467 ppm phosphorous to the formulated oil, and
• wherein the calcium salicylate has a TBN of about 200 mg KOH/g present in an amount in the range 1.2 to 3 wt %,
• wherein the deposit formation as measured by TEOST 33C (ASTM D6335) is substantially lower than the levels achieved using a Group IV lubricating oil not containing the borated hydroxyl ester amide-amine mixture, the zinc dialkyl dithiophosphate and the calcium phenate or calcium sulfonate detergent.