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Here in Montana the winters get very cold, to the tune of -30 to - 40 below zero and sometimes that is the daytime high. I have used Mobil 1 in the wifes car and I use Purus 5w-40 in the truck since both were new. The truck has always started flawlessly and I drive it back and forth to work every day (cept when I am out playing with our trailer) The old girl runs like a top and doesn't burn a drop of oil between changes of 7 to 10 thousand miles. I am a believer in synthetic oil here.
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