Synthetic based oils do not typically contain sulphanates. Mobil, as an example recommend
Mobil 1 synthetic gear oil in lieu of a GL-5 lubricant that does contain sulphur and as
you correctly state is injurious to copper, brass, and the like.

Does non-synthetic 10w30 motor oil contain sulphur?
I suspect that one or more of my servers is compromised by a hacker, virus, or other mechanism:


What are my first steps? When I arrive on site should I disconnect the server, preserve "evidence", are there other initial considerations?
How do I go about getting services back online?
How do I prevent the same thing from happening immediately again?
Are there best practices or methodologies for learning from this incident?
If I wanted to put a Incident Response Plan together, where would I start? Should this be part of my Disaster Recovery or Business Continuity Planning?


 This is meant to be a canonical post for this topic. Originally from serverfault. 
