Buying first bmw, need advice

As title says, i decided to get one.

We are not talking new, i have 12k euro roughly and im currently only interested in older models. Must be 6 cylinder. Automatic if possible since i dont trust manual bmws, and i prefer petrol instead of diesel.

Currently eyeballing e90, e92 and e60.

They are all high mileage, the lowest one is 204xxx km, others are between 240xxx and 300xxx km

I understand how stupid i may sound for even considering this, but i live once and wish to experience the bmw shitbox.

All replies are welcome, thanks in advance! :)