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The lower the first number the better (for cold). If your vehicle uses 5W-30 oil normally you could go to 0W-30 for the winter months. Typically the oil cap on your car will say on it what oil to use. Make sure you use an oil with the same second number as recommended but the first number can always be a lower number. Some cars run with 5W-30 and some with 5W-20. The one with 5W-20 can also use 0W-20. For cold weather it is best to use the "0W" 20 or 30 because of the cold starts. The 0W helps the oil flow a little easier at cold start ups. Also using a full synthetic is very helpful too in cold weather starts. So, go with a full synthetic "0W" oil in winter. Both Mobil1 and Valvoline make good full synthetinc 0W-30 and 0W- 20. I use those brands in my vehicles in the winter.

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