...IF YOUR ENGINE IS ONE THAT USES SYNTHETIC OIL....FORGETABOUTIT!......SYNTHETIC 5W40 IS LIKE WATER IN COLD WEATHER....IF You're running Dino 15w40 that is another story....find that solenoid and add a on/off switch[use a 50 amp marine switch as they don't fail easily and will outlast the truck]...geofkaye
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