lithium is probably Ok, I use a silicone grease called Molycote- it wont dry out over time like some petroleum greases, or so the claim goes. It was expensive stuff ($30 for a small tube)(good to 300 degrees F)- I got a free sample from a vendor). Some types of 3 in 1oil can get gummy over time, or so I've heard. I use zoom spout turbine oil from ace hardware for motor bearings, and it seems to work well for that. for most changer parts i use grease. There is a product called Phonolube that is made for stuff like this as well.
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