Transmission fluid – a special class of machine oil designed for use in different friction transmission vehicles, and in various gears. Engine and transmission oils are made of mineral or synthetic basis, and then lagerbuchse with a variety of additives, but the requirements on the gear above, as they work at much higher loads and sliding velocities of friction surfaces. One of the most important indicators of such oils is the ability to create a protective film on the surface of friction to prevent mechanical contact between them. In hypoid gears used oil by entering into a chemical reaction with the surfaces of the parts, preventing them from stepanie possess extreme pressure properties. In the process of operation transmission oil oxidize and become contaminated, so they must be changed periodically. Good is oil with low tendency to oxidation. Since different manufacturers use different additives to mix their products not. When you replace the transmission must be thoroughly washed, if possible the same of fresh butter.
Klassificeret transmission fluid or viscosity, or by performance. So SAE (Association of automotive engineers) they are divided into nine classes five summer and four winter (index W). For each class indicates the viscosity index. SAE 70W SAE or 250, for example. For multigrade oils indicated double index (SAE 80W-90, etc.).
The API (American petroleum Institute) divides oils into 6 classes depending on the operational properties - GL-1…GL-6. These classes is similar to that used in the Soviet GOST 17479.2-85 TM1…TM6. The fifth and sixth groups are used in hypoid and have very high lubricity and extreme pressure performance.
Choosing the gear oil, you should focus primarily on their working conditions. If a class will be lower than necessary, the mechanism will simply fail, and the higher grade oil has a higher cost, leading to cost overruns. It is also important to consider at what temperatures will the transmission, and on this basis to pick up grease. SAE 85W, for example, will work at temperatures down to -12°C and 85W already to -40°C. In the automatic gearbox uses a special low-viscosity liquid, so no motor or gear oil in there do not apply.
Today in the market a large range of manufacturers offer their gear oil - LUKOIL, Total, Texaco, Reksol, Norse, and many others. A variety of additives used, determines the level of quality of oils, and their price range. Mineral, usually costs less, but is less synthetic in exactly the opposite. A good compromise in this case will polysynthetic as the Golden mean between the first two. Also, be wary of fakes, and not to buy oil in untested stores. To change the box is always more expensive than good quality oil, especially now that the replacement to the replacement they nursed from 60 thousand kilometers and more.
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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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