I've just finished stripping and cleaning a Woden Q/R engineers/fitters vice (around 3" jaw, 6" capacity).
The slide was a big stiff, so I've carefully filed it true, parallel and smooth, and the motion is now very nice – free with little slop.
Next step, reassemble, mount for a workmate, like this small one.

But for use – what's the best lubrication for the ways, thread/half nut, and screw-to-jaw contact?
Looking around my workshop, house and garage I found the following:
- Duckhams Keenol grease
- Hypoid gear oil EP80/90
- Car Engine oil SAE20/50
- Lawnmower engine oil SAE30
- 3-in-1
- GT85 (PTFE) cycle chain lubricant
Which would be best, and for what?
BugBear