Not all drivers understand the relationship between viscosity and motor oil. Viscosity levels refer to oil's reactions with temperature. The heat can thin out oil while cold can thicken it, and too much of either is not good for the engine. Additives inside motor oil adjust thickening and thinning to temperatures. The viscosity level becomes known through a rating present on the packaging. Understand the rating, and you'll understand what oil might be best.

One thing you'll notice on the oil's label is the letter W. W is short for "winter," and the number right before it represents the cold-weather viscosity rating. To the right of the W is a dash followed by another number. That particular number indicates the heat viscosity rating.

When getting your oil changed, you need to choose the correct viscosity. Otherwise, the oil won't fully protect the engine against the elements.

At Faith's Ford Westminster, we want to help you keep your engine safe. Our service department in Westminster, VT, performs scores of routine maintenance jobs.

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