2003 540i M sport manual for cheap

[tkd540]

Hello, thanks for reading this random post.
I came across this beautiful one owner black on black 2003 BMW 540i 6 speed manual with a real M sport package, that I found on Copart (I’ve purchased cars from copart before with great success)
I decided I wanted to go check it out in person since it was only 15 miles from me (Rancho Cucamonga, Southern California).
I got a carfax for it and it did indeed have one original owner.
Once I got there and saw the engine bay, I realized my suspicions were correct, the car must have been passed down to a less caring family member. During 2017 the car stopped getting work done at a bmw dealer and switched to a Nissan dealer, also during that time the mileage stopped being recorded on carfax (it had 123k miles in 2017).
I turned it on and it started right away but it had a loud knocking noise. With my scanner I was able to see it has around 173k miles (LED pixel issue, that’s why I couldn’t see the miles on the car)
I wanted to share it in the hopes that someone who’s mechanically inclined will save this beautiful rare car.
The body seemed to be in great condition.
Here is the copart lot number 45410233

I know it’s a long shot, and if I didn’t have 3 cars currently I would buy it to get it worked on in the future.