| abstract |
A lubricating oil composition containing a base oil of lubricating viscosity,noverbased sulfurized alkylphenate detergent or its calcium salt, an overbasednalkylsulfonate detergent or its calcium salt, an ashless dispersant, and a zincndialkyldithiophosphate and/or zinc diaryldithiophosphate is described. Thenlubricating oil composition provides improved heat stability and anti-wearnperformance in marine diesel engines operated under severe conditions wherenthe cylinder liner temperature reach 200 to 260°C. |