Low ash lubricating oil composition for gas engine

Abstract

The gas engine lubricating oil composition with low ash content of the present invention comprises base oil, pour point depressant, viscosity index improver, antifoaming agent, metal detergent composition, polyolefin succinimide type ashless dispersant, antioxidant and antioxidant Corrosion agent and anti-wear agent, the metal detergent composition is a mixture of high alkali value metal salt and medium alkali value metal salt or low alkali value metal salt. It can meet the lubrication requirements of vehicle gas engines fueled by liquefied petroleum gas (LPG) and compressed natural gas (CNG). Corrosion performance and anti-wear performance, while having low ash content (sulfated ash content 0.1%-0.6%, weight ratio), which can effectively prevent the gas engine from premature ignition.

Description

(1) Technical field

[0001] The invention relates to a lubricating oil composition, especially a low ash gas engine lubricating oil composition with excellent lubricating performance, cleaning performance, dispersing performance, anti-nitrification performance, anti-oxidation and anti-corrosion performance and anti-wear performance. (2) Background technology

[0002] In recent years, with the attention to environmental protection, gas engine vehicles fueled by liquefied petroleum gas LPG and compressed natural gas CNG have developed rapidly. A notable feature of gaseous fuels is the high combustion temperature, which accelerates the NO X generation, while NO X As the blow-by gas in the engine cylinder enters the crankcase, the lubricating oil in the crankcase is more likely to be nitrated, thereby shortening the service life of the lubricating oil. In addition, lubricating oil is easy to form deposits in gaseous fuel engines, but gaseous fuels have insufficient cleaning abi...