Whenever you select a motor oil for your car, you may notice the numbers on the front of the bottle. These numbers, like 5W-30 and 10W-40, indicate the rate of flow and its resistance to flowing quickly, and are known as the viscosity rating.
The perfect viscosity of any motor oil depends on the temperature at which the car is running, and the temperature affects the operating viscosity of the oil. This is why there are two numbers in the rating: the first indicates the viscosity in cold temperatures and the latter in hot temperatures. The "W" that separates them stands for "winter," indicating the cold temperature rating.
Low viscosity ratings are helpful to get your car running well in cold weather, while higher viscosity ratings can protect your engine during hot operation. Visit us at Nourse Chillicothe Ford Lincoln in Chillicothe, OH for friendly, knowledgeable oil service for your car.
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