Some engines and gearboxes have generic and/or inherent faults. This can be caused by design errors or using unsuitable materials. I draw your attention to the Freelander 1800 petrol engine. After 10 years such faults are well documented. I haven’t seen any reports about the Sportage engine and/or gearbox so I was wondering if anyone else had. For example, https://www.briskoda.net/forums/topic/241066-so-exactly-how-common-are-problems-with-pd-engines/ has someone asking about exactly the same thing but another marque. As they are too much of an unknown quantity I shall not be buying one.