WD-40 is a terrible lubricant actually, especially for high friction parts like limb joints. WD stands for Water Displacement and is good for treating wet rust and expelling moisture, but terrible for minimizing friction.

What you’d really want is SAE10-30 or if she’s older, an oil with a higher viscosity like a SAE20-40.

I liked this post and not ten later Tumblr brings me this