Paint a Zinc Plated oil Pan?

There's plenty of paints and primers designed to be painted onto zinc plated/galvanized metal. it's a tad more expensive. Though, I've always just roughed it up and sprayed it with plain old engine primer without any trouble. Course, I don't know how well it'd hold up after fifteen years either.

But heck, if you don't mind the look, leave it. it looks nifty.