Define "keep it lubricated". Unless you've got something on board feeding it, you are going to grind away something. I know I don't need to tell you about the softer metal bushing. And why they don't last forever.

Go with a smaller axle and put the bushing in there and then if the strut hole is too big, bush it with brass tubing over the axle. If this is even your problem.

It works great, ask me how I know