The reason you are not supposed to lubricate lug nuts is not because that may allow them to come off. As mentioned above a bolt depends upon stretching to maintain enough force to keep it from loosening. Different type of lubricant will greatly vary the amount of torque that needs to be applied to a fastener to attain the correct stretch. The only way manufacturer can be assured the the proper amount of force is applied is to is to have a uniform method of tightening the fastener. Specifying clean, dry threads is one way to accomplish this.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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