This Warren Buffett stock is begging for your attention. Warren Buffett knows a thing or two about oil stocks. And while his track record hasn't been perfect, betting alongside one of the best investors of all time is a wise strategy for making money over the long term. Lately, Buffett has been loading up on one oil stock in particular. Last quarter, he increased his position in it by more than 7 million shares. So if you're on the hunt for oil stocks with attractive long-term upside, this one is worth cons ...