Third, check
　　After fastening the connector, shell l should check the height and quality of the oil, because the liquid will gradually lose and oxidize at high temperature, resulting in a decrease in liquid level and poor performance
　　1, check the battery level with a diameter of 5 N 6mm test tube, from the liquid mouth vertical force to contact with the filter, thumb closed the upper end of the test tube, lift the tube, test the height of the liquid column is the battery level, the standard should be 10 N 15mm.
　　2. Check the height of lubricating oil level
　　When the cold car, take out the oil ruler, wipe clean, insert into the bottom of the oil sump, after the observation of its height should be between the upper and lower line. When the hot car should be off, until all the oil into the oil sump before measurement.
　　3. Check the height of the liquid level of the coolant. The coolant in the tank should be full and the liquid level in the expansion box should be between the marking lines. When hot turning, the liquid level should be slightly higher than the superscript
　　4. Check brake fluid and steering liquid level
　　Unscrew the bolt and directly observe whether the liquid level is within the specified demarcation line.
　　5. Check the quality of oil
　　No matter what kind of oil, the following methods can be used to check.
　　(1) appearance method: check the oil sample taken out, if it is transparent, it indicates that the pollution is not serious; If it is foggy, there is water in the oil. If gray, may be contaminated by lead or other abrasive; If black, it is polluted by high temperature exhaust gas.
　　(2) diffusion method: drop a drop of the extracted oil sample on the filter paper. If the oil droplet area is very wide and there is no obvious difference between the oil droplet area and the diffusion area, the cleanliness of the oil is good; On the contrary, it is the deterioration of oil cleanliness.
　　Four, supplement
　　1. Oil supplement
　　If there is no obvious deterioration of the oil during the inspection, it is necessary to find out whether the oil is leaking or not. If there is, it should be excluded and the oil of the same level should be filled in time.
　　2. Oil replacement
　　If the oil deteriorates or exceeds the replacement period, it should be replaced in time.
　　The oil is usually changed every 8000km or half a year. Change brake fluid every 20,000 ~ 40,000 km or 2 years; Replace the coolant once every 1-2 years; Replace the hydraulic oil every one year or ten thousand kilometers.