I use Bachmann 99981 conductive lube for all of my pickup rollers. It is a very thin oil. I add one drop on each end of the roller and one drop on each hinge pin. I do lube the axle ends on my metal trucks with HL653. It's the same oil I use on my loco axle shafts as well. One drop on each end and your good to go for a while.
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