Lubricant oil composition for internal combustion engines and method for producing same, and method for preventing pre-ignition

Abstract

A lubricant oil composition for internal combustion engines, comprises a base oil (A), a metallic cleaner (B) comprising a calcium-based cleaner (B1), a zinc dialkyldithiophosphate (C) and a molybdenum-containing compound (D), wherein the content of the component (B1) is more than 100 ppm by mass and up to 600 ppm by mass in terms of calcium atom content relative to the whole mass of the lubricant oil composition, the content of the magnesium-based cleaner (B2) is less than 200 ppm by mass in terms of magnesium atom content relative to the whole mass of the lubricant oil composition, the content of the sodium-based cleaner (B3) is less than 200 ppm by mass in terms of sodium atom content relative to the whole mass of the lubricant oil composition, the ratio of the content of phosphorus atoms derived from the component (C) to the content of calcium atoms derived from the component (B1), i.e., [P / Ca], is 0.25 or more by mass, and the sulfated ash content is 0.7% by mass or less. According to a method for producing the lubricant oil composition for internal combustion engines, and a method for preventing pre-ignition by using the lubricant oil composition for internal combustion engines, it is possible to provide the lubricant oil composition for internal combustion engines, which has a satisfactory friction-reducing effect, can prevent the occurrence of LSPI in a spark-ignited internal combustion engine, and has reduced adverse effects on an exhaust gas purification device; the method for producing the lubricant oil composition for internal combustion engines; and the method for preventing pre-ignition by using the lubricant oil composition for internal combustion engines.

Description

technical field [0001] The present invention relates to a lubricating oil composition for an internal combustion engine, a method for producing the same, and a method for suppressing preignition. Background technique [0002] In recent years, in order to improve the fuel consumption (fuel consumption) of spark ignition internal combustion engines such as gasoline engines, the introduction of engines equipped with supercharging mechanisms such as turbochargers and superchargers has been promoted. In addition, through the direct injection of the engine equipped with a supercharging mechanism, the torque at a lower speed can be increased, and the exhaust gas volume can be reduced while maintaining the same output, so the fuel consumption can be improved and the mechanical loss can be reduced at the same time. proportion. [0003] However, in an engine equipped with a direct-injection supercharging mechanism, a phenomenon called Low-Speed ​​Pre-ignition (Low-Speed ​​Pre-Ignitio...

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Problems solved by technology

Therefore, the occurrence of LSPI may adversely affect the improvement of fuel consumption or cause engine failure.

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