Another manipulated property
Most motor oils are made from a heavier, thicker petroleum hydrocarbon base stock derived from crude oil, with additives to improve certain properties. The bulk of a typical motor oil consists of hydrocarbons with between 18 and 34 carbon atoms per molecule.7 One of the most important properties of motor oil in maintaining a lubricating film between moving parts is its viscosity. The viscosity of a liquid can be thought of as its "thickness" or a measure of its resistance to flow. The viscosity must be high enough to maintain a lubricating film, but low enough that the oil can flow around the engine parts under all conditions. The viscosity index is a measure of how much the oil's viscosity changes as temperature changes. A higher viscosity index indicates the viscosity changes less with temperature than a lower viscosity index.
Motor oil must be able to flow adequately at the lowest temperature it is expected to experience in order to minimize metal to metal contact between moving parts upon starting up the engine. The pour point defined first this property of motor oil, as defined by ASTM D97 as "... an index of the lowest temperature of its utility ..." for a given application,8 but the "cold cranking simulator" (CCS, see ASTM D5293-08) and "Mini-Rotary Viscometer" (MRV, see ASTM D3829-02(2007), ASTM D4684-08) are today the properties required in motor oil specs and define the SAE classifications.
Oil is largely composed of hydrocarbons which can burn if ignited. Still another important property of motor oil is its flash point, the lowest temperature at which the oil gives off vapors which can ignite. It is dangerous for the oil in a motor to ignite and burn, so a high flash point is desirable. At a petroleum refinery, fractional distillation separates a motor oil fraction from other crude oil fractions, removing the more volatile components, and therefore increasing the oil's flash point (reducing its tendency to burn).
Another manipulated property of motor oil is its Total base number (TBN), which is a measurement of the reserve alkalinity of an oil, meaning its ability to neutralize acids. The resulting quantity is determined as mg KOH/ (gram of lubricant). Analogously, Total acid number (TAN) is the measure of a lubricant's acidity. Other tests include zinc, phosphorus, or sulfur content, and testing for excessive foaming.
The NOACK volatility (ASTM D-5800) Test determines the physical evaporation loss of lubricants in high temperature service. A maximum of 14% evaporation loss is allowable to meet API SL and ILSAC GF-3 specifications. Some automotive OEM oil specifications require lower than 10%.
Cheating in repairing
The best solution when it comes to servicing cars of choice is a trustworthy mechanic. It is not always possible, however, and often urgent need to repair our car brings us to the first workshop better. Therefore, the maintenance of cars is often very complicated process, and a relatively small portion of the users of cars are aware of this, as should proceed car repair easily become a victim of fraud. We can never be sure yet how much of the car has been mentioned, if you do not have enough knowledge on this topic. Therefore it is worth before going to the workshop to do some research on this type of service, for example, among family and friends.
What follow when choosing a mechanic?
Defects or minor failures occur in every car, and this is due to its operation. It would seem that the older the car, the more trouble, however, and the latest models can sometimes give bone its owner. In such a situation, there is nothing else to look for a mechanic who not only repair the vehicle, but the occasion does not demand for the service a lot of money. The cost will depend on how large the scope of work will need to be carried out and whether it is necessary to buy spare parts. Surely every driver wants to give up your car in the best possible hands, so it is worth looking mechanics guided by the opinion of customers who have already benefited from its services and are happy with the result.