Find out when the water pump was changed if you can thru bmw carfax (sometimes its on there) if you cant find out then plan on replacing it. Thats the only thing I dont like about them is the electric water pump. Mines still on the factory one at 80k miles. I have a new one still in the box I keep in the hatch area. Going to change it "one of these days"
Last but not least get a p3 gauge.
https://www.p3cars.com/bmw/
Its what the car should of had from the factory. Everyone that see's it goes nuts over it. I kind of take it for granted since Ive had it so long. I leave it set to showing water temp.
I shot a video of it in action here :
https://www.youtube.com/watch?v=XFpu8ODQFgI
The cruise control is cool on these too. It uses the brakes to maintain speed and the led shooting around the outside of the speedometer is cool.
https://www.youtube.com/watch?v=mp5xUPSXre4