Originally Posted by
singerguy
not sure about stocking up as per industry standard the shelf life of grease is 1 year. Maybe 2-5 years is really pushing it. I just keep mine 1-2 years max and I buy new ones. I hope someone can contradict or has experience in using grease that has more years shelf life on them. I've gotten so many vintage grease in metal tube and I just toast them as I think it's lost its lubricating properties. Imagine a grease that's been sitting for 50 years. I will never use them on my machines. That's just me. Some members swear by using them and it's working great.
Why and how would grease go bad? I can understand if it was used previously or contained contaminates or in an open container. Standard grease from what I can find out is a specialized mix or oil and soap, synthetics is another story. If the container had been kept closed what would make it go bad?