Use Mobil 1 in your hobby oiler for extended service intervals. For taking up a little slack in the armature bearings, & all gears, use a good synthetic grease like Lucas Red 'N Tacky #2
Rob
For most of my post war steamers, a drop of oil on each end of the armature shaft works well. But I have one 2056 Hudson that doesn't seem to benefit from the oil. So for that one, I put a little Lubriplate white lithium grease on each end of that shaft. Works like a dream.
Jim
Modeling the Baltimore waterfront in HO scale
Bakelite is pretty much impervious to all solvents, so you're not going to hurt it.
Bakelite is unaffected but the commutator can be. Excess oil can get trapped between the gaps of the copper plates and brush dust will be caught there. This degrades the motor performance. Lubricate sparingly, most brush covers have an oil wick and just a small drop will do. It's good practice to clean the gaps between the copper plates with a tooth pick or dental probe.
I'd suggest lubricating both ends of the amature.
Any light machine oil works well-even 3-in-1 oil. Bakelite is pretty much impervious to all solvents, so you're not going to hurt it.
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