A lithium based lubricant like Lubriplate or Amsoil is what is used in situations where it needs to be weatherproof, like garage doors. I'd call Marvin on Monday and ask them what they recommend, and see if that's OK with them.

In addition, if your windows bind frequently, perhaps they are slightly racked, or not enough expansion gap was left in the rough opening. I'd get out a level and check the first situation. If the RO is too small, not a lot can be done at this point.

I agree with Holly and vinyl jamb liners really should never need to be lubricated with a proper install as he mentions as well.

Wellllll, be that as it may, these need to be lubricated. The Lubrisol that you mentioned is petroleum based, so a no-go. The search continues!

what would be wrong with furniture paste wax?

-dkenny

Pam cooking spray?