You can fix a burned oil for as little as $100 and repair it for up to $5000 or more. It just depends on what causes the oil to burn. A burned-out head unit can be replaced and cost upwards of $500. If the damage involves multiple internal engine components, expect to pay between $2,000 and $4,000. If the problem is the type of oil, you can change your oil for as little as $100. In short, the higher the number of defective components, the higher the cost.