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Motor oil must flow to protect engines; it must cover the moving parts in hot and cold weather. The viscosity ratings describe the flow in high and low temperatures. The three-part rating lists the cold flow rating, the letter W, and then the hot weather flow rating. A popular type like 10 W 30 is a blend of light(10) and heavy(30) oils.

Drivers know that it is essential to use the right type of oil. It is also necessary to change the oil before it breaks down.