Medium for Oil Painting

Medium that I use for Oil Painting   (answer to a question I received)

Over the years I have used different mediums, but the one that I like the best now is the following recipe:

1 part Damvar varnish
2 parts stand oil (sometimes I use linseed oil)
3 parts odorless mineral spirits (gamsol)

I use a small amount with the paint in the later stages of the painting to help it dry faster.  In the first stage of the painting I use gamsol only. 

Note:  Sometime I don't use medium at all.  Fresh paint can be just the right consistency without medium.