[norm356]

No, WD40 is not a lubricant, it leaves behind a sticky residue which is designed to repel water condensation. Using it on moving parts will lead to troubles later.

Use a spray lithium based grease. If yours is really gummed up, clean the joints first with some spray brake cleaner, then apply the spray grease liberally to each joint and cycle several times to work it in.

 

[norm356]

The factory used a lithium based grease (spray aerosol is the easiest to apply), because it lasts extremely long, is resistant to temperature and dust, lubricates very well (most wheel bearings are also lubed with it) and the plastic slider is made from a material which is naturally resistant to it.

I googled Walmart's Super Tech General Purpose Grease, but could not find anything which said what it was made from. On the back of the label of the aerosol version it mentioned paraffin (wax).

It might be best to seek out something like this:

https://www.walmart.com/ip/WHITE-LITHIUM-GREASE-10OZ/16817414

It would be about as close to the original as possible.

I would caution against using a silicone grease because, weird as it may sound, silicone can sometimes cause sticking issues, depending on the mating materials.