Guarantee times are different between cars industries. The most important thing is to check the person / company is selling you the product really exists and reveals a long experience. USED ENGINES must be guaranteed. Guarantee means that the product must be checked professionally, with experienced staff and with the technology allowing these processes. In case the engine would present any kind of problem, guarantee means being planned to collect quickly the engine and sort it out as soon as you can. First of all, be sure that the saler exists and it’s really experienced. They don’t have to be intermediary. Experience is a must. Nowadays, Internet offer us the chance to know companies/industries and their histories: the location, the owner and managers, how long they have been existing. Surfing, you can find as well, companies that don’t know accurately the product sold, its conditions because they trust to the intermediary and they don’t know the history of the product ( if the car had any other problems, where it comes from, but first of all, they even have no experienced staff and technologies to work on it).