ENGINE OIL ADDITIVE BATCH AND OIL CONTAINING SAID BATCH Russian patent published in 2012 - IPC C10M169/04 C10M133/12 C10M133/16 C10M135/18 C10M137/10 C10M145/14 C10M145/26 C10M101/02 C10M105/36 C10M105/18 C10M107/02 C10N40/25 

FIELD: chemistry.

SUBSTANCE: additive batch contains alkaline calcium alkylsalicylate, a solution in oil of a carbonated product of reaction of alkylbenzene sulphonic acid with calcium hydroxide, having base number less than 390 mg KOH/g, ash-free nitrogen-containing dispersant, a block copolymer of ethylene and propylene oxides based on ethylene diamine, modified dialkyl dithiophosphate, phenyl-α-naphthylamine, octylated diphenylamine - the balance. The modified dialkyl dithiophosphate is a 50% solution of a mixture of an amine salt and an amide of dialkyl dithiophosphoric acid in oil with tetra(2-ethylhexyl)thiuram disulphide, taken in weight ratio to the 50% solution ranging from 1:3 to 3:1 with atomic ratio of sulphur to phosphorus in the range of 3.25-11.5. The engine oil contains a mineral base, a batch of additives, an anti-foam additive and a polymethacrylate depressant with molecular weight from 2800 to 3200.

EFFECT: improved antioxidation, anticorrosion and deactivation properties while maintaining the level of antiwear and antifriction properties with reduction of sulphated ash and content of sulphur, phosphorus, which increases the oil-change period in an engine and time between repairs.

3 cl, 13 tbl