| abstract |
The present invention provides a low ash engine oil composition which, despite the low ash content, has engine detergency which enables the composition to pass severe detergency tests for diesel engine oils. The engine oil composition contains 0.6 percent by mass or less of a sulfated ash and comprises a low ash engine oil composition with a sulfated ash content of 0.6 percent by mass or less, which comprises: a lubricating base oil with a % C A of 2 or less, a kinematic viscosity at 40° C. of 25 mm 2 /s or less and a viscosity index of 120 or greater; a viscosity index improver contained in such an amount that the viscosity index of the composition will be 160 or greater; (A) a metallic detergent with a metal ratio of 3 or less; and/or (B) a sulfur-free phosphorus compound. |