Forget about just production machines. If you have ever had a customer complain about hearing a popping or coffee peculator noise when their copier was running, it is the bearings in the fusing unit. I have encountered it even with low volume models, 20 to 40 ppm. And when the head of purchasing has her desk within earshot of the noise maker, you do something about. High temperature grease is the easiest answer. Most copier manufacturers have a grease that they recommend and sell, for a price. Some as much as $80US for a 3 oz tube. Years ago I did some research and found that Super Lube synthetic grease with Syncolon® (PTFE) works very well and at only $5.99 for a 3 oz tube at a local Harbor Freight Tool location was both inexpensive and readily available.
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