I think you can use many different things, I have even used 30wt non detergent in a pinch. Does make it retract slow in cold weather. LOL I do normally keep a bottle of the jack oil on hand. You can get it most anyplace that sells automotive supplies, even WalMart. With that being said, I believe that for all around best performance and longevity the regular jack oil is probably best, though I do believe the differences are small.