Honestly, some of you seem like you shouldn't even be buying this car lol. Build tolerances on cars nowadays are very tight, much more so than they were before on mass manufactured vehicles. As I assume you know, heat causes materials to expand. The moving parts in an engine actually wear and start losing some of their surface as they do so. This is called wearing or breaking in because that's actually what happens. The surfaces seat against each other as they wear, and since the tolerances are tight to begin with, as they heat up and the materials expand, those tolerances become super tight to the point where they can possibly bind under extreme conditions, especially sudden extreme conditions. Moderate use of the engine and car for a certain number of miles allows all those components to wear-in against each other gradually so once they are worn-in, as they expand under heat they are now within designed tolerance. The amount of material that was worn off during the break-in period is now in the oils and filters, which is why you also want to change the oils and filters after the break-in period.
If this is a car you want to keep, or you're simply considerate enough to want to take care of it for another owner to enjoy after you sell it, just follow the recommended procedure. It really won't take that long.