My Dad and grandad taught me, because they sure weren't going to do it for me!
BikeForums members tend to make things complicated. Can I use any old oil on my chain? No, you must use dry lube, or gooey lube, or three chains which you wax in rotation (don't tell your wife about the crock pot), or Ceramic Speed chains for $200. And WD-40 will destroy it utterly.
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Genesis 49:16-17