All vehicles including cars, trucks, buses, and various other machines have manual or automatic gear boxes to transmit the power generated by the engine to the wheels. These gearboxes or transmissions require lubrication in the form of transmission oil or gear oil to lubricate the gears as well as to cool them so as to seamlessly transmit power to the required wheels.
Take SUVs for example; these 4-wheel drive options need a little help to negotiate those rough and steep terrains. This is done with a transfer case, which in turn needs transmission oil so the vehicle runs smoothly. Automatic transmission vehicles use ATF (automatic transmission fluid), and manual transmissions use gear oil for the gearboxes.
Remember; newer vehicles that utilize automatic options will have more gears involved. This means you have to be plentiful when it comes to the transmission oil. This is very important if you want any sort of longevity from your machines. If you're looking for the best oils then it has to be one that offers a special formula of chemical detergents, anti-foaming additives, rust preventatives, dispersants, and even anti-wear or anti-oxidation properties. Your ATF will be matched with specific criteria, but if you can't figure it out on your own then check the manual. Some of the manufacturers will even mention preferred oil brands. These are by far the best options for your transmission.
When talking about manual transmissions they will still require certain gear oils so the gears continually shift with ease. If you didn't know this already, manual gear boxes are usually given an oil bath. In fact, the lower portion of the gears is immersed in gear oil permanently. This also helps spread the oil to other gears thanks to the rotation. Take the time to view the oils available with American Petroleum Institute (API), starting with GL.
Thus API GL 1 usually specifies gear oil for light use in simple gearboxes while GL 2 and GL 3 usually specify oil for moderate uses. GL 4 is one of the most commonly used oils in most light, medium, and heavy vehicles, especially in Europe. Finally, API GL5 and GL 6 are used in extreme conditions and these oils have varying levels of anti scuffing agents to handle heavy use. Again, many manufacturers do list their preferred brands in their owner manuals although owners can still choose a matching oil of their choice. However, owners should replace these oils within the mentioned time-frame to avoid jamming or slipping of gears.
It's also possible that some synthetic transmission oils are required if you need to improve performance levels. The difference between these and others is that they offer better lubrication abilities, as opposed to mineral oils. Now, they will cost more than your regular transmission oil, but its well worth it. You can do your own research on this, but the biggest oil available that is approved by several manufacturers is Shell.
Just about everyone has heard of them before, so it's helpful to know their oil selection is for both manual and automatic transmissions. It can work for a variety of parts like; axles, transfer boxes, power steering units, as well as other components under Spirax and Donax. When it's time to figure out what transmission oil to use it can find the exact specifications. This also works for gear oil, and thanks to big name promotions you will find that General Motors approves Donax TX oil. Their version is the GM Dexron III.
If you can find the ideal transmission oil or gear oil for your needs, it will ensure the transfer of power from engine to wheel and owners. Your goal is to find the best possible oil for your vehicle's transmission, or even your company's machines. Once you're able to utilize oils with longer draining times, they will be extremely beneficial in all areas; including those harsh conditions. In the end it helps keep drivers safer on the roads, and operators being able to handle their machines better, and for longer periods of time.
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