-- Last Updated: Nov-03-12 9:12 AM EST --
"The Watco Teak oil seems to have a little better staying power than the regular and it tends to darken light colored ash a bit more than regular Watco oil..."
I recently oiled a new cane seat with Watco Teak Oil expecting and hoping it would darken the ash wood somewhat. No dice. It looks just like it did before the oil, but with a little sheen. I'm going to have to sand it down again and stain it, then re-oil.
BTW, Watco Teak oil is not just oil, it contains some varnish. I think some people call it a "wipe-on varnish".