The longevity and a good function of the engine are dependable of many factors but the most important one is the oil. This has the roll to lubricate the internal components and maintain them clean, to reduce the attrition, to reduce the friction, to ensure a economy in the fuel consumption and to protect the engine against the effect of corrosion.

     The oil engine can be mineral (petrol), but also obtain with the help of chemical integration of other materials. Usually the petrol molecules of the base oil are long connections of carbon, sensible to contact, that weakens in time, changing the oil properties. In the synthetic oils case, the molecules are more resistant to collision. Based on the function of ability to respond to the requirements of the new high teak, the oil can be classified after standards established by the American Institute of Petrol and Society of Automotive Engineers. A few of this criteria’s are: viscosity factor, (VF); the degree of SAE – and this classified 11 classes of viscosity; Total Base Number (TBN) – that indicates the ability of the oil to neutralize the acids (usually TNB is between 8 and 12); the API system – that indicates the ability of the oil to respond the requirements of the most engines on the market.

     To prevent the weakness of the molecular connections we require a special additive that helps in maintenance of the viscosity of the oil and protection against the corrosive factors. The additives are polymers or polymers complex that decrees the rate when the oil changes it viscosity in high temperature modes.

     The most important property of the oil engine is viscosity, so said the resistance leak. This property varies in function of the temperature (deducts in high temperatures) and its absolute necessary to remain in the correct parameters to protect the engine of high temperatures. The viscosity is not allowed to change its parameters to much, because otherwise it will do damage to the engine. We can obtain the viscosity factor by comparing the viscosity of the oil at 40 degrees Celsius to a progress in a high temperature about 100 degrees Celsius. That shows us how much the viscosity factor varies: if the modification takes place in a bigger area, the variation is smaller and the oil is more performance.

     The deep freeze additive protects the oil from low temperatures, and obstructs the solidification of the oil. The engines erode faster because of the break in the film oil, and that happens when the oil has a viscosity very increase and its circulation is altered or stopped at some moments. The capacity of the oil to drain in low temperatures and the minimum temperature that result in liking of the oil are indicated by the dropping factor. When temperatures reach negatives numbers the particles of paraffin that are in the oil crystallize them selves and that deduct the resistance in liking. The roll of additive is one of stopping the unification of the paraffin crystals by isolate them into microscopic particles. The deep frees additives are used only for minerals oil, synthetics ones doesn’t contain paraffin and that conclude that the synthetic ones can be used in very low temperature.

     The anti attrition additives accedes on the metallic surfaces, forming a small pellicle that protects the engine between the parts. This pellicle does not complete isolates one component from another, but slightly increase the protection for the components.