I was doing a totally unrelated search for my floors and ran across these two sites. http://www.wwforum.com/faqs_articles/foiloilfin.html

http://wood.bigelowsite.com/aracnetlive/wood/Wood_Finishing_With_Oil.htm

I don't know anything about either of these methods. The first one looks like it might be easier on veneered items the second seems more suited to solid wood. I'm going to try them on some scrap oak and walnut as an experiment, if anyone is interested I'll report back.
This might be the ticket for those old tired, dried out, thrift store finishes that seem to follow some of you home. :)
I've used a lot of linseed oil in a homebrew cleaner, but not mixed with poly.
Brad

Brad,

I've never heard of mixing linseed with polyurethane or varnish either. Thanx for posting this helpful information.

Rob

I just hope it works. It sounds like it might be a good "old time finish". Might be just right, depending what your working on.
Brad

That's a variation of what is known as an Oil-Varnish finish. It will not provide half of the protection of most traditional floor finishs. It is usually applied on woodworking/ fine woodworking projects, and is one of my favorites. If you try to do big sections at a time I guarantee the stuff will begin going off on you, and you will end up with an uneven finish as well as a bunch of lint stuck all over the place.

Watco is a weaker thinned down version that is so watered down it, even five coats will provide minimal protection.


[EDIT]
Oops, I see this is not for your floor. Anyway, I like equal parts of Turps, varnish, and Linseed oil, Successive coats will go off quicker, and if you wipe it off unevenly the sheen will be uneven. Plan to have enough clean rags on hand, and remember that a bunched up rag may combust spontaneously. Lay it out flat and let it cure first.