I found some online for my PL-71, and just went downstairs to look for it. Do you think I could find it??? Nope.
I think I got it from these guys...
http://turntablebasics.com/silicone.html
For $10 it's worth a shot. I think shipping was around $4.
Alternatively, there is silicone gear oil sold at hobby shops for RC buggies that is 500,000 weight.
Dave