Such a simple question, so much conflicting answers on the web.

Lithium grease? Lithium spray? Motor oil? Silicon spray? About the only
point of agreement is not to use WD-40.

One door is a Genie with a threaded rod drive. The other is a Craftsman
with a chain drive. What to lube the threads on the Genie with and what
to lube the rails that the trolly slides along?

Thanks,

Ray