Buying Cayenne S Diesel – detail questions

Hello everyone, I have a few questions about the Cayenne – I’m looking for a diesel S in the range 2014-2016 with low kilometers. It’s going to be my first Cayenne, and my first Porsche and that’s why I have a few detail questions: Differences from the 382hp-385hp engine? I hear that the desired performance has been increased a lot. Is there anything else you should know? When did add-blue come? Difference Euro5/Euro6? Apart from the obvious, what difference does it make? Euro 5 sounds better or is the imagination of the owners? (you read a lot of things here in the forum…) Facelift – there are also differences in the interior, I look there every now and then Navi screens where one looks a bit more modern than the other – what does it look like? Purchase: I am not an expert in cars, therefore I prefer to look around in the offers of the PZ. But I just saw one of private. Price, equipment and location fit. The car is still until 2020 under the Pors che approved guarantee. Is it possible to buy something like this with half a good conscience? Generally, there is the possibility to have the car inspected by Porsche – so it’s easy to hit even with offers from private people (provided positive test)? Exterior: Can one also have the lettering removed? mfg grani13 PS: Or does someone else want to make me taste the Cayenne S petroler?