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I never plugged in this one or my 02. We have temps here to 0 all winter long. The manual states it's better for the bearings etc. I should think about plugging in but I always used 5w40 synthetic and let it idle for a while then drove away slowly. But I think 15 or 20 degrees is too high to plug in.
Most gassers don't plug in at all. This truck does start real good at low temps.
But on the other hand Cold starts wear parts faster.
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2011 F350 Lariat DK.Blue/Silver,Black Leather Crew Cab,Short Box SRW. Supplemental Heater,3.55 ELD, Remote Starter. Used for hauling 16ft x 8.5ft. Work Trailer , 8ft. Fisher Plow, Lance 820 truck camper for those days I can get away.
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