Many salvage yards offer a 30-90 day warranty. You are still out the labor but at least you get your money back for the part. I would do a little research on realoem as to what blocks and heads will fit. If you can start with a E90 328i N52 long block, that is the easiest engine to find at low cost. If the block is the same, things would need to be swapped from your old engine such as oil pan and intake manifold.
I am curious what happened to your original motor? It is tough to kill one. And are you replacing the motor yourself?
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