Realistically, if an oil company was interested in buying out SaVi, it wouldn't be to market the Dynovalve so much as to squash it. Lower fuel economy = greater fuel consumption which, as we've all seen, can be overwhelmingly profitable to them.
I don't see it happening (acquisition by oil company, specifically). Anything is possible, but the Dynovalve is kinda targeted towards older vehicles, isn't it? Much more likely that they would be bought by someone else if they're bought at all.
Then again, if someone were to consider it, they would also have to consider taking on the Yorkville debt, too, right?