The only thing I can offer is that where I worked before I retired we used linear recirculating ball slides. They specifically said grease but do not use PTFE impregnated grease. This turned out to be harder that we first thought because when we looked into it a lot of greases had PTFE in them. My machines do not get a lot of use as they are hobby machines but I just use an aerosol glide-way lubricant on the ball screws once in a while.
Martin
