Well tempered question?

As a followup I contacted the Dynavector company, who now is the dealer for Well Tempered products. The lubricant used in the platter bearing can be 5W20 or 5W30 weight synthetic motor oil. The damping material used in the tonearm cup is 100,000 cSt silicone. this can be ordered from Turntable Basics online.
I hope this is helpful information.

I have had several experiences setting up the WT Reference tonearm for a friend of mine who has owned the WTR tt and tonearm for nearly 20 years. IMO, the stock damping fluid in the tonearm well is way too viscous. If I had my druthers I would use something less dense and less of it. He may or may not have the stock fluid in his well (100,000 cs?), but it is so viscous that if you raise the tonearm, it will hang in mid-air before VERY slowly settling back down. I do not think this is optimal for tracing an LP that may have small warps or vertical undulations in its grooves.

Thanks for your information. I've been reading quite a bit about the effects of fluid viscosity on damping mechanical motion. To give readers a point of reference you can think of SAE60 motor oil having a viscosity of approximately 1,000 cSt at room temperature. Corn syrup is around 2,000 and good old Hershey's chocolate syrup is about 15,000 before it hits your ice cream and changes. Next time you put mustard on your hotdog remember it has a viscosity around 60,000 cSt. Tomato paste oozes out at around 150,000.
The recommendation of 100,000 cSt comes directly from Bill Firebaugh, the table's designer. Maybe your friend's table, like the one I have, has not had the silicone changed in quite a while? Mine is very thick, more like peanut butter.

And the viscosity of peanut butter is....?
I confess I have developed an antipathy toward that WTR tonearm. It does not hold VTF or azimuth, and it is over-damped (admittedly possibly due to something my friend did to it; he is now suffering from early stage of Alzheimer's and cannot remember what fluid he put into it).

I guess I haven't reached that level of frustration yet. My other turntables are a Maplenoll and an AR, two widely divergent designs that seem to be at opposite ends of the "pain-in-the-neck" scale. The WT seems somewhere in the middle and I like the originality of the designer.
I believe Skippy Creamy is 220,000 cSt at room temperature.
Cheers!