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I still have a partial can of US Navy Small Arms Grease from the 60s, well, I got it in the 60s, it's from the 40s. I use it sparingly on a variety of things.

A bunch of years ago I shot an IDPA match with a person who was a rabid "oil only" advocate. During a match he shot his gun dry and suddenly he was getting failures to feed and extract. A finger full of grease from my primer tin fixed it for him.

When I was a Teletype mechanic I had a trick I learned in the Navy reinforced. Grease is nothing more than oil with an added binder, and we adjusted the viscosity of both the oil and grease we used on our Teletype equipment. Sure it wasn't very scientific, but the recommended grease and oil were rare, and it was really just slightly heavier oil and lighter grease, and what we did worked. When I refilled the oil bottle in my tool kit, it got about a half teaspoon of grease added to it, and a fresh grease tin got about a tablespoon of oil stirred in.