I came to the decision to buy a 986S a short time ago. So when I searched the internet for models I fell on the almost every second used one carries a replacement engine under its hood. May I conclude that the engines from approx. 100000 km of mileage destroy themselves or is the quality of this model not the one that corresponds to a real Porsche.? Please advice? Do I have to pay attention to anything for the purchase? Or should I rather buy a SLK or Z4 and (due to quality)? Would be grateful for answers!