Tractor five-purpose lubricating oil composition

The invention relates to a tractor five-purpose lubricating oil composition comprising the following components in percentage by weight: 3.5-5.5% of high-temperature detergent, 3.5-5.0% of ashless dispersant, 1.0-1.7% of oxidation and corrosion inhibitor, 0.4-2.5% of oiliness agent, 0.03-0.1% of metal deactivator, 5.0-12.0% of viscosity index improving agent, 0.3-0.8% of pour point depressant, 0.001-0.005% of kilfoam, and the balance of solvent refining base oil or hydrogenated base oil. The lubricating oil composition has easy availability of raw materials, simple production process and highperformance price ratio, and can meet the oil consumption requirements of a whole oil consumption system, namely engine, hydraulic pressure, driving, braking and speed changing of large-medium sized tractors, thereby effectively simplifying oil varieties and avoiding mechanical failures caused by wrong use of oil products; and by using the lubricating oil composition, each lubricating system of the large-medium sized trac