| abstract |
To provide a lubricating oil composition for an engine equipped with a supercharging mechanism capable of reducing the occurrence frequency of LSPI while using a calcium-based detergent. A lubricating oil composition for an engine equipped with a supercharging mechanism, comprising: a base oil (A), a metal-containing surfactant (B) containing at least a calcium-containing surfactant (b1), and a metal carbonate , metal hydroxide, and at least one basic compound (C) among amine compounds, the content of sulfur contained in the aforementioned metal-containing surfactant (B) is based on the total amount of the metal-containing surfactant (B) 0.2% by mass or more, the content of calcium atoms is 0.08 to 0.20% by mass based on the total amount of the composition, and the content of calcium atoms derived from the aforementioned basic compound (C) and the aforementioned calcium-containing surfactant (b1) The mass ratio [(C) content/calcium content derived from (b1)] is 2.0 or more. |