Most of you may believe that lubrication is important to almost every mechanical part. Thus, the transmission fluid also deserves people's attention because it can provide much-needed lubrication to the complex set of gears and other moving parts in the transmission of a vehicle. Both manual and automatic transmissions need the transmission fluid to keep the proper performance.
There are two types of transmission fluid which can be widely used in the vehicles. Those are traditional transmission fluid and synthetic fluid. Although the latter type costs more than the former one, no one can give an exact answer whether the former type is better or not because they both have their own characteristics and can be applied to meet different requirements. For example, synthetic fluid should be used if you drive a high-performance vehicle under demanding conditions on a frequent basis. But in order to keep your car in a good condition, you must serve the vehicle and replace the fluid regularly whatever type of you use.
Now let us talk something about them specifically. The synthetic fluid has become increasingly popular because it doesn't lose its viscosity or coating ability. Moreover, it is also able to transfer heat more evenly for longer periods of time.
Generally, it is man-made, produced from refined oils treated with a variety of chemical additives. As is mentioned before, it can retain their viscosity longer than conventional fluids; as a result, you do not have to change them frequently.
Traditionally, transmission fluid has been petroleum-based. In manual transmissions, the biggest problem is fluid contamination either due to oxidation or friction between the moving parts that shear minute metal particles into the fluid.
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