N20/N26 engines are known for timing chain guide failures among others. https://en.wikipedia.org/wiki/BMW_N20

If the rest of the car is in GOOD shape it might be worth saving. Sorry I can't help with a mechanic in the DFW. Good used N20s are scarce. Try to find out if it's had the timing guides replaced.

(no idea why BMW thought putting a gritty little 4-pot in such a heavy-ass car was a good idea...)

https://youtu.be/4tLR24WL9jc?si=IlB01uSsYg1FAViD

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