Really old gun oil

[Olle]

Originally Posted by gunnertwo

I would say it depends on the type of oil used.

I'd say you're right. I have seen some guns with old oil or grease that looked like brown, sun dried pine sap, while others (like my Roth-Steyr) have had perfectly good factory grease in them. I'm not sure how long it would take for "bad" lubricants to harden, but I have seen it in many guns from as late as the '70s.