Ask the seller to ensure the car is cold when you get there. I’d happily do this for any buyer.
Mr Tidy is correct, the N52 & N52K are both prone to lifter tick when cold, but I wouldn’t be concerned by that if it goes away once the car is properly warmed up.
I wouldn’t actively search out a black top over a silver top, I’ve had more than one of each and you can’t tell the difference with the bonnet closed.
Best of luck with the viewing