Connect with us. If you really want to get good prices, waiting days will help your gauge the seriousness of the seller, as well as the overall condition of the car. You don’t need a huge capital outlay to start this business, or even great mechanical knowledge although naturally, this would give you an advantage. If you’re wary that someone is taking advantage of you or neglecting the entire story, trust your gut and walk away. Next check the exhaust for oil blue-colored smoke. Bigger problems mean bigger repair bills.