Question

How does multigrade oil work?

Answer 1

hey mate here's ur answer..........

Hot molasses flows more readily than cold molasses. SAE 10W-30 is a multigrade oil. ... As the engine heats up, the viscosity changes to that of SAE 30. Thus, one type of oil works in all temperatures.......

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Answer 2

you want explanation on short form

Multigrade oil contains special additives. They keep the viscosity of the oil almost constant as the temperature changes.