Multigrade oils meet the requirements of more than one SAE grade and may therefore be suitable for use over a wider temperature range than a monograde oil. Multigrade oils are made by blending a low-viscosity oil with special additives called Viscosity Index Improver (VII) VII are additives which improve the temperature/viscosity characteristics of oils. Oils containing these additives, combine the good starting and friction properties of a thin oil at low temperatures with the good lubricating properties of a more viscous oil at high temperatures.
The mechanism by which these polymers work, is that at low temperature, they curl themselves up into a tight ball that moves freely with the oil molecules. As the temperature increases though, they expand into a large stringy structure which restricts the normal flow of the oil. As the temperature reduces, they go back to their original shape. The result is that for example, when these polymer additives are blended in the correct proportion with an SAE15W oil, the oil flows like an SAE 15W oil at low temperatures and like an SAE 40 oil at high temperatures. The result is an SAE 15W/40 oil that will provide wide protection over an extended temperature range.
Advantages of Multigrade Oils
· One oil for year-round use
· Improved low-temperature starting
· Excellent high-temperature performance
· Improved overall fuel economy - less idling time and faster warm up
· Less battery drain on cold starts
· Fast
· full-pressure lubrication over a wider temperature range
Disadvantages of Multigrade Oils:
· Low temperature oil leaks may occur on badly worn engines
· Polymer shearing may occur under high stress and/or shock load conditions
Conclusion
Multigrade oils are the preferred option for all modern engines.
Multigrade oils will keep equipment operating in an optimum viscosity range, and offer consistent response and lubrication protection.
MANUFACTURING PROCESS OF MULTIGRADE DIESEL AND GASOLINE ENGINE OIL is not very complicated. For the production, there is need usable and tried a formulation, ingredients ( performance and another additives, base oils,foam agent, pour point depressant, etc. ) and process tank. For ingredients to be used, quantities to be used and ingredients usage rankings, you should look into this formulation and manufacturing process. Therefore, formulation and productıon process of MULTIGRADE MOTOR OIL are important. If you have not a good formulation, you cannot make healthy and efficient production of any lubricating oils.
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