Read oil inspection report:
　　We all know that the car with gasoline and diesel regular testing project has: density, distillation range, copper corrosion, mercaptan sulfur, steamed pressure, oxidation stability, benzene content, oxygen content, sulfur content, moisture and mechanical impurities, the actual gum, carbon residue, octane value, cetane number etc., and inspection of diesel lubricity, detection of polycyclic aromatic hydrocarbons and other projects.
　　So, get a Fu with the examination of the work, to indicate the inspection items and data of the "test report", how to understand the quality of oil? Below we on the oil testing, especially in the car with a diesel test commonly used items to answer: the meaning of the performance of the oil
　　1, oil distillation, is refers to oil under the provisions of the conditions obtained by distillation of beginning to run to the final boiling point said evaporation characteristics of the temperature range. Mainly used to determine the amount of light and heavy fractions of oil products, control the quality and performance of the product.
　　2, the octane number of an agreed value -- on behalf of spark ignition engine fuel antiknock. In the standard engine test under specified conditions, the comparison is made with the standard fuel. The volume percentage and measured with the same fuel antiknock fuel standard in isooctane. The method of determination of octane number is different, the resulting value is not the same, therefore, it should be pointed out that the method should be used when using octane number.
　　3, motor octane number - the higher the temperature of the mixture (generally heated to 149 degrees Celsius)
　　2 and higher engine speed (generally up to 900 RPM) of the harsh conditions for its characteristics of the experimental standard engine measured octane value.
　　4, the research octane value -- a lower mixture temperature (generally not heating) and lower engine speed (up to 600 rpm) medium harsh conditions for the characteristics of the standard engine determination of octane number.
　　5, saturated vapor pressure, is used to illustrate the evaporation capacity and the size of the oil in the pipeline into tend toward the loss of light fraction oil system in the formation of air resistance and the possibility of storage and transportation. Gasoline vapor pressure, evaporation, form the possibility of air resistance, during storage, evaporation loss.
　　In 6, flash point, is refers to the petroleum products under the provisions of the conditions, heated to its vapor and flame contact occurs, the lowest temperature of flash fire. Oil is lighter, lower flash point. The dangerous grade oils are divided according to the flash point. From the point of judging the severity of oil composition, oil fire hazard identification. With closed tester determination of flash point called the flash point, commonly used for determination of light oil. The higher the flash point of safety.
　　7, Dr. test - in the presence of the sublimation of sulfur, sodium lead acid sodium and light petroleum products, to check the oil in the test of thiol or hydrogen sulfide test.
　　8, closed, with the provisions of the closed tester measured by flash flash, C said.
　　9, opening, with the provisions of the open flash point tester measured flash point flash point, said to C.
　　10, ignition point, under the provisions of the conditions, when the flames near the oil surface oil and gas and air mixture will fire and continued to the provisions of the time required for low temperature combustion, expressed in degrees.
　　11, spontaneous combustion point - under the conditions, the oil in the absence of flame, the spontaneous ignition temperature, expressed as.
　　12, sixteen alkanes value -- a prescribed amount of diesel fuel in the engine ignition performance. In the standard engine test under specified conditions, the comparison is made with the standard fuel. The volume percentage of the sixteen alkanes in the standard fuel with the same ignition lag period as the fuel is determined.
　　13, sixteen index - a calculated value of diesel fuel in the engine. The value is calculated from the standard density of the diesel oil and the 50% distillation temperature. In general is not less than sixteen alkyl or sample check-in can not be used when the engine test standard.
　　14, point - refers to the highest temperature of oil under specified conditions to stop the flow of cooling. The pour point is used to evaluate the performance of low temperature oil project.
　　23, what is the corrosive?
　　Corrosive substances are not allowed in the oil. Differential method is the brass plate immersed in the oil tube, heating tube to 200-220 DEG C, remove the cooling, if brass have brown or black spots that oil in a corrosive substance. Otherwise, no corrosive substance.
　　24, what is the ash?
　　At high temperature, not volatile substance called burning ash. The oil ash increases, while mechanical wear intensifies.
　　25, what is the cold filter point?
　　Is an important indicator to measure the low temperature performance of light diesel oil, in particular, is under the specified conditions, diesel began to plug the maximum temperature of the engine filter. Users in the selection of diesel brand, should be cold filter point of the specific values as a reference. The cold filter points are as follows: 5 light diesel cold filter point is 8 degrees Celsius, 0 light diesel cold filter point is 4 degrees, -10 light diesel cold filter point is -5, -20 light diesel cold filter point is -14. Therefore, it shall also take into account the local temperature and diesel grade corresponds to the cold filter plugging point select diesel, namely: ambient temperature of 4 DEG C when elected No.0 diesel, ambient temperature for 5 DEG C when elected - 10 light diesel oil, more than analogy.