What grade of gasoline , not necessarily with the sedan class, displacement related . Like the European system of POLO car, the price is not high, but the engine compression ratio of 10 or more, preferably 97 or use gasoline . In other words , what grade of gasoline , mainly to see the engine compression ratio.
Car Engine compression ratio and recommended grade of gasoline , in the specification of each car can be found . If you're looking for trouble too , you can also consult auto 4S shop or car manufacturers.
According Kero  Throttle Valve aware, there is estimated that every 10 because of a lower grade of gasoline used , after a long time there were minor problems, for example, increased fuel consumption , engine power decreased , affecting driving comfort. Usually do not feel it when driving , does not affect use, but when examined often , but off , sometimes while driving engine failure will light .
In comparison, the European and American systems of vehicles with low- grade gasoline easier "sick ." Mainly European and American car engine emissions standards are high , if you use a low- grade gasoline , gasoline incomplete combustion can clog catalytic converters, oxygen sensors easily damaged, reducing gasoline antiknock ( antiknock gasoline gas mixture is , without prior burning ability ) , affect the service life of components .
In general, the compression ratio of at least 10 cars, you should use 97 gasoline . Of course, experts also have different versions, some believe that the compression ratio of more than 9.5 should use 97 gasoline ( In layman's terms , the compression ratio is the piston stroke is running , and the bottom of the combustion chamber volume when the piston is at the top of the combustion chamber volume ratio ) .

        Is the actual grade of gasoline antiknock gasoline antiknock gasoline with the standard ratio . Higher the grade , the stronger the anti-knock properties , but not label the higher the better , according to the gasoline engine compression ratio reasonable choice label. Zhongyu Information analyst Zhao Yongbo , under normal circumstances, 93 oil 90 oil expensive than 5%, but also small power consumption of around 5% , the amount of funding fuel per hundred kilometers is theoretically equal.

Good quality thin oil film will protect better, the cleaning effect , sealing , power lifting , quiet , engine start other indicators are a little higher, from an environmental point of view, to help reduce emissions , in addition, if long-term use of a suitable oil also fuel efficient.

View from the domestic quality of the oil , gasoline quality is relatively poor , therefore , the quality of the oil is higher . In general, the automotive original semi-synthetic motor oil is the family car , the total synthesis of semisynthetic expensive than 100 yuan .

Kero  Throttle Valve reminder : Oil is not the more expensive the better , according to the weather and other indicators to choose, such as some of the most expensive Chevrolet does not use oil. Turbocharged models requires high temperature and good mobility oil , to select the W40 . To select wear a little oil , mobility will be relatively poor, and liquidity will almost better abrasion resistance , wear and tear on the engine relatively larger impact . Therefore, follow manufacturer's recommendations , choose the right is the best.