Not too many decision's with cars are "good financial decisions"..... so let that rest with you as it may.
I noticed that the wheels are also not style 351 or 373, so not 650 OEM, though they do look like M6 wheels, don't know the Style #, but then there is the offset question.
As far as I know, valve stem seals were not an issue on the N63TU. Since this one (2016) is a TU, you have the new and improved version.
My 2016 650 I have had now for at least 3+ years, and put 40,000+ mostly trouble free miles on it (new O2 sensors DIY). It now has 83,XXX. Still running strong. I am the second owner and I do baby it, with the occasional sprint but ONLY when the oil temperature is up to normal operating temp. Next oil change I am doing a Blackstone Oil analysis to see what I can learn from it.
Let us know how it goes.
L
