| abstract |
A METHOD FOR PREPARING A HEAVY DUTY DIESEL LUBRICATING OIL ADAPTED TO COMPLY WITH THE SPECIFICATIONS OF THE AMERICAN PETROLEUM INSTITUTE CE, WHICH HAS A METAL CONTENT SUCH AS THE OIL HAS A TOTAL LEVEL OF SULPHATED ASH OF LESS THAN 0 PES AND A RATIO BY WEIGHT OF SULPHATE ASH TO DISPERSANT FROM 0.01: 1 TO 0.2: 1, INCLUDES MIXING A MAIN AMOUNT OF LUBRICATING VISCOSITY OIL AND (A) 3% BY WEIGHT OF A DISPERSANT WITHOUT ASHES, (B) 2% BY WEIGHT OF A SULFURATED ALKYLPHENOL OXIDATION INHIBITOR AND (C) AN EFFECTIVE ANTI-WEAR AMOUNT OF A METALLIC SALT OF A DIHYDROCARBYL DIETHIOPHOSPHORIC ACID WHERE EACH OF THE AODO HYDROCARBONIC GROUPS IN AOS. |