Abstract NOVEL ALIPHATIC ACID DERIVATIVES OF HIGH MOLECULAR WEIGHT MANNICH CONDENSATION PRODUCTS OF (1) HIGH MOLECULAR WEIGHT ALKYL-SULBSTITUTED HYDROXY AROMATIC COMPOUNDS WHOSE ALKYL-SUBSTITUENT HAS A NUMBER AVERAGE MOLECULAR WEIGHT ($N) FROM ABOUT 600-100,000, (2) A COMPOUND CONTAINING AT LEAST ONE HN< GROUP, (3) AN ALDEHYDE IN THE RESPECTIVE MOLAR REACTANT RATIO OF 1:0.1-10-1.0, AND (4) 0.1-10.0 WEIGHT PERCENT OF AN ALIPHATIC ACID HAVING AT LEAST 6 CARBON ATOMS ARE OIL SOLUBLE AND IMPART HIGHLY EFFICIENT ASHLESS TYPE (METAL FREE) DISPERSANT-DETERGENT PROPERTIES TO LUBRICANT OIL ADDITION AGENTS. LUBRICATING OILS CONTAINING THESE COMPOSITIONS PROVIDE A HIGH DEGREE OF PROTECTION AGENTS THE DEPOSITION OF SLUDGE AND VARNISH AND CORROSION WHEN USED AS CRANKCASE LUBRICANTS.