I agree 100% with what Roadwarrior said. Here's another helpful bit of information...
There are oils labeled "non detergent." You do not want to put that oil into your car. It's the cheapest kind of oil available, and it's basically for old junkers that don't/won't go over 30 miles per hour. At interstate speeds, this oil will fry your engine. Please, don't put non detergent oil in your car unless you want to completely destroy the engine.