In a large pot, heat 1 tablespoon of the vegetable oil. Add the bacon and cook over moderate heat until browned, about 5 minutes. Add the onion and cook, stirring occasionally, until softened, about 5 minutes. Add the collard greens and cook, stirring, for 2 minutes. Add the wine and cook, stirring, until the collards are wilted, about 5 minutes longer.