Not only has the function of engine lubrication, oil also has many other uses for the engine. Helps protect oil film prevents the metal surfaces in direct contact with each other, protect the high load bearing surface when oil was "swept" out of metal and corrosion protection for metal surfaces and alloys . Engine cooling lubricant dispersed when the heat generated by friction and combustion of fuel to more than 350 ° C in the piston. Moreover, oil helps clean the parts inside the engine. In addition, oil was forming between serge cement sealant, piston and the cylinder to keep the pressure in the combustion chamber and reduce the burning gases pass down the lubricating-te.Dau which holds residues are kept suspended in oil, avoid forming scum large size can clog the oil filter.
This is a necessary concern for those who use cars. Because during use, oil will be metamorphosed by heat (oxidation, pyrolysis), contaminants (dust, water, fuel) and the amount of additives in the oil consumed in the operation. Thus, while oil use long or short depending on the oil quality, the working conditions of the engine and ambient conditions. So after a period of use, lubrication will no longer ensure the lubrication and engine protection, hence the need to let go and replaced new lubricant after a certain period of use. Time is often periodic oil change vehicle manufacturer recommendations over time or specific number of kilometers operated. However, in severe operating conditions or adverse environments, the oil needs to be replaced sooner than periodic instructions, usually about 2/3 the number of kilometers operated. About refineries, after replacing engine oil 2-3 times, then we should replace oil filter 1 times. The reason is that during engine operation has generated scum clinging to oil filter, oil filter after a time will not work well anymore, easily leading to unfiltered lubricant, causing serious impacts to the vehicle's engine.
Best car users should refer to the manufacturer's instructions , the information is usually indicated in " Guide for the user " ( Owner 's Manual) . The instructions are usually the viscosity grade ( SAE ) and the tier of oil ( API - defined by the American Petroleum Institute ) and the vehicle user can select lubricants on the market with technical features fit and brand reputation to be assured of quality.
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