I would guess some minerals might however when the TO 20/30 and the TE/TEA came off the production line they were filled with mineral oil.
 
Use Multi-Grade 10W/30 oil now, It is a better oil that the original GL1 type. It won't get as thick and gloopy when cold and it prevents wear better than the original GL1 type as well.
John(UK)
 

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