Q: I have a 1994 GMC pickup. When it gets cold it is very hard to unlock the driver door. A couple of times I have had to unlock the passenger door to get in. We tried spraying WD-40, but that hasn’t ...
Sometimes moving parts go into applications that just can’t risk exposure to petroleum lubricants. Nobody wants grease in their corn flakes, for example. Ditto for pharmaceuticals. Mechanical-carbon ...
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