If oiling the pickup rollers causes them to get gummed up then likely either they are using the wrong lubricant or are using too much, there is a reason why they recommend using a light oil for this. I have used various light oils, also used tuner cleaner (unlike contact cleaner, it has a lubricant in it as well, and is designed to lubricate and allow conductivity). If pickup rollers are seeing severe arcing, it is likely the roller is worn and not making great contact with the fail, or the rail itself is dirty or pitted. As far as heat goes and friction, if a roller is properly lubricated it shouldn't be heating up that much.
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