Originally Posted by jphughan
Dude, I have some news for you that may blow your mind and/or bring you to tears. That engine under your hood? It's used too. So what? As long as the block is solid and hasn't been abused, used is perfectly fine.
And yes OP, it states this in the manual (maybe M3 Supplement) that whenever components that require break-in are replaced, you need to perform the break-in again. So you should follow the specified break-ins every time you replace your tires and brakes too.
Exactly how is my engine used?
Also, there is no way for anyone to know whether a block was abused or not. You could be getting someone's blown s/c block for all you know. Just cause it passes a list of tolerances, doesn't mean it was babied.