Comment by jabl

> You're right about getting industrial lubricants in bulk for cheap. But I don't need 55 gallons of lubricant. I'd never use it all nor do I want to store it.

Well, the corollary to that is that if it's just small case usage then if you buy a 1L bottle of some general purpose lubrication oil for, say, $5, then it doesn't really matter in the grand scheme of things that the price/L is a lot higher than if you buy an entire drum of the stuff. ;-)

> Used engine oil isn't really suitable for lubricating an engine anymore but it's fine for a temporary lubricant of a drill bit, some random hinge on a gate, or stubborn bushing on a piece of equipment. Engine oil is only really replaced on an engine because at some point it degrades enough that things like oil film bearings in the crankshaft would start to fail. A bushing on something like a small dump trailer doesn't rotate at 2300 rpm.

Fair enough. I guess I just don't see the benefit here vs just having some bottle of cheap unused lubricant. Except if used engine oil is the only thing you happen to have at hand.