Some questions about car maintenance

Transmission oil is the role of lubrication, cooling and power transmission, but different decided three main gearbox structure they need lubrication in different ways, thus determines the transmission they require the use of different properties of oil. Manual transmission gear oil: oil is usually manual gearbox oil said, only lubrication. USA Petroleum Institute will vehicle gear oil according to the using performance is divided into GL-1, GL-2, GL-3, GL-4, GL-5, GL-6 six. The emphasis on the overloading of the GL-1, GL-2, GL-3 have been eliminated in the market, and the current domestic car use generally were GL-4, GL-5 (GL-6 bus is used). From the product characteristics, the most intuitive is manual gearbox oil is bigger than the automatic transmission oil viscosity, the replacement cycle generally than the automatic transmission oil is shorter, the majority of household car at 4-6 million kilometers to replace the manual gear box oil.

AT gearbox oil: automatic transmission oil is special, it has two functions, in addition to the planetary gear lubrication, cooling, more important is to make is to transfer power, so its viscosity than manual gearbox oil as "thick". But its main role is to hydraulic transmission, so very good fluidity, anti bubbling ability than manual gearbox oil stricter requirements.

Automatic transmission of different types of oil is not mixed with AT gearbox, because different types of oil flow rate, density, dynamic and static friction properties, thermal expansion coefficient are different. Some manufacturers is according to the characteristics of AT transmission is introduced with matching gearbox oil, suggested that the owner or in the 4S store replacement or purchase the corresponding models were replaced, do not replace other models.

CVT gearbox oil: CVT gearbox oil essence and AT oil is similar, but it is also a special oil, because the CVT transmission is the steel chain transmission characteristics, need oil velocity, friction, coefficient of expansion is different, so you can't use AT gearbox oil instead of. Relatively speaking, it is the AT automatic transmission oil to dilute some, also has the certain prevent damping friction drive chain slippage.

Lubricating oil on three main gearbox, between absolute cannot replace and mix! Oil AT gearbox similar oil and CVT gearbox oil also can not replace each other, if it replaces the use of the short time, although not what impact, but a long time for the mechanical wear is not recoverable.

In the replacement after the engine oil, the need for rough with the engine oil dipstick, so if it adds a car go, will find that just added to the bit oil shortage phenomenon. This is because the gap between the many parts in the static gas after not inject new oil, such as oil guide hole, so be sure to start the engine again after the measurement in oil after the oil, make full to the level corresponding to the. At that time usually appear a small amount of fuel deficit phenomenon, again added to the standard position. Recommendations go to the 4S store maintenance when the attention of the details.To do better on cars, you can know more car tools like Launch X431 IV and t300 key programmer.