The disclosed technology relates to a lubricating composition comprising an oil of lubricating viscosity and an ashless basic amine additive selected from a secondary amine containing -carbon aromatic substitution. The basic secondary amine additives used in the lubricating oils of the disclosed technology impart basicity measured as total base number (TBN) without adding sulfated ash. Lubricating oils containing the basic secondary amine additives of the disclosed technology simultaneously achieve seals compatibility, deposit, and corrosion control.

This invention relates to a diesel engine lubricating oil composition comprising or resulting from the admixing of: (i) base oil, (ii) a functionalized polymer, (iii) an overbased magnesium based detergent, (iv) an overbased calcium based detergent and (iv) one or more, optionally borated, higher and lower molecular weight PIBSA-PAM dispersants. The composition has a total sulfated ash of less than or equal to 1.0 wt. %, a kinematic viscosity at 100 C. of 5 to 20 cSt, a total phosphorous level of less than or equal to 0.120 wt. %, and a total sulfur level of less than or equal to 0.4 wt. % and provides a Cummins ISM oil filter delta pressure (OFDP) test result at 150 hours of less than 30 kPa. Also provided are a method of making the composition, a method of lubricating a diesel engine, a method of improving wear performance and soot dispersancy and reducing emissions of a diesel engine, and a diesel engine oil additive concentrate composition.