Hi,
Rem oil is actually a very fine oil for small sliding parts, that's why it is labeled "Gun Oil"!
If you want to oil bearings or shafts in a motor use the "ZOOM" oil as mentioned.
It is available at any ACE Hardware.
If you want to clean a motor or switch get "contact" cleaner.
WD-40 is not an oil but is a water displacent and used for other things such as cleaning dirty parts.
Use the right product for the job!