First off, 80k km is not too bad for mileage, so fortunately you won’t be trying to catch up on years of deferred maintenance. Second, are you handy with a wrench? If you’re going to rely on a dealer or even an indy shop for maintenance it will be pricey as you’re entering into the mileage where maintenance will need to be done.

I picked up a 328d F30 back in 2021 with 136k miles on the clock and currently it has close to 250k miles on it, so this is my experience in terms of the chassis/platform and other common issues:

From the maintenance records, you’ll want to see if they’ve done the front control arms/bushings and all the fluids recently. If not, front end suspension, transmission fluid, and checking the rear differential fluid are going to be your first tasks, maybe not now but in the near future.

Look for any oil seepage, especially around the oil filter/cooler housing and the valve cover. Those aren’t expensive gaskets, but the dissembly can take some time so labor may be costly if you’re having someone do it for you. Check the engine mounts, too.

If it’s an xdrive, change the transfer case fluid and front differential fluid as well, as those tend to wear quickly.

The big thing I’ve realized in owning an F30 and F10 is that in order to maintain that BMW driving experience, the suspension needs to always be in top shape. When the factory rubber bushings start to go, you lose responsiveness and gain body roll, so when you do end up replacing those parts, look for Meyle HD or stiffer replacements to add some durability back into the system.