Most vehicles these days use various grades of different engine oils. Engine oil grade definitions would take years to explain as the range is so vast. But Whether it is conventional oil, full synthetic oil, semi-synthetic or higher mileage most engine oils have a common function.

What is the function of engine oil in an internal combustion engines?

The main function of motor oil is to reduce wear & frictional resistance between internal moving parts. It also helps the cooling process of moving parts by transferring heat away from the frictional surfaces. There are several others functions to be mentioned but these in my opinion are the most important.

Each vehicle manufacture spends millions on research & development for the correct engine oil specification to be used & chooses the correct grade of oil thereafter to best suit that models specific needs. Following factors are carefully considered before a decision is made

  • Materials used on parts manufactured
  • Cooling ratio of internal parts
  • Climate in which vehicles are operated in
  • Engine & parts design
  • And many more

The SAE designation for multi-grade oils includes two viscosity grades, 10W-30 designates a common multi-grade oil. The first number 10W is the viscosity of the oil at cold temperature and the second number is the viscosity at 100 °C.

The second number in the viscosity rating “40” in 10W-40, for example. Tells you that the oil will stay thicker at high temperatures than one with a lower second number the “30” in 10W-30, for example.

So, the next time you considering an engine oil rather choose the grade specified by the manufacture because they have done the research for you already

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