When you are looking at a second hand car I think you know deep down call it a gut feeling if it’s a good one or not. I realise it says you’ve not bought it, so i’m late to the party, but the fact you asked the question in the first place means it was bothering you, I did exactly the same in July, I found a car and wasn’t 100% happy with, asked a few questions on here and walked away, the dealer wasn’t particularly happy but tough. The following day found another identical one, and this one I new instantly it was the one for me, it was £700 more expensive than the first, but to me the extra cash was value , the fact it had a full service history and had just had a gearbox service with warranty had premium tyres fitted etc I’m sure your perfect car will be just round the corner, and you’ll be glad you waited.