As Rives audio pointed out, the best thin oil money can buy is from bicycle source. Tri-flow, Superlube, and others are the best thin oil money can buy. If you need grease, white lithium grease from bicycle store is also the best source.
If you need in betwee, any synthetic motor oil should do a fine job.
If you need in betwee, any synthetic motor oil should do a fine job.