It may be held in several ways. It means balance the performances of a used engine with a new one and guarantee the same level of quality. It depends according the car’s owner. As often and wrongly happens, saving money is preferable than be worried about car engine inspection to check its quality. A good inspection concerns the replacement of all the damaged mechanic parts such as pistons, bush, strips; an engine shaft can be inspected but having a new one is extremely different as it represent a fundamental part of the engine. There is, as well, the cylinder head and all its components as fundamental part. It’s compulsory which kind of inspetion has been processed to the car and what the customers prefer, as the person who is buying the product will know the meaning of satisfaction. Sometimes, repairing the engine is pretty much expensive because the unique main block is damaged. It’s advisable, for this reason, to look for a used engine or, for a part of it, to find a solution. These are decisions mainly held with the car repair shop is going to work on it.