It's probably a leak somewhere, maybe the oil pan gasket. I had to replace mine. It's fairly easy if you know what you're doing. It may be your oil filter, too. There's a couple of things it could be. Just keep checking the oil, and if your having to put in a quart every other day or so, or you still see oil on the driveway, I'd say go and get it checked out. i hope that helps a little!