| abstract |
The invention provides a lubricant oil composition useful fornreduction in friction loss and improvement in fuel economy in internalncombustion engines, particularly, a lubricant oil composition for internalncombustion engines exhibiting an excellent friction reducing effect even in andiesel engine equipped with EGR accompanied with an increase in soot contentnin oil. The invention is a lubricant composition for internal combustion enginesncomprising a lubricant base oil consisting of a mineral oil and/or synthetic oil ornthe like incorporated with 1 wt% or more, based on the total weight of thenlubricant oil composition, a nonionic surfactant with alkylene oxide addednthereto consisting of at least one compound having an HLB value of 15 or morenand a molecular weight of 900 or more, and a friction reducing method forninternal combustion engines using this lubricant oil composition. |