Wow misinformation galore...
- There are NOT abrasives in an lubricating oils in the M3 nor any other production car.
- The engine internals do not need to be heat cycled to harden them.
- The car most likely does not come with special break in fluids.
- All modern engines are taken to redline multiple times in the factory likely before the engine and chassis are even mated.
- Factory break in procedures are probably as much or even more for the tranny and diff as the engine itself.
- Anecdotal evidence about soft vs. hard break in does not establish that one or the other will consistently produce a broken in engine with more power. This takes study, science and maybe some statistics to prove
- That being said it does appear pretty clear that most engines make more power after broken in than when totally fresh.
Lastly to Legion5:
Since you are so prone to calling folks out to list their experience/sources/degrees/etc. then that comes right back to you. Please tell us the F1 teams and engineers you've spoken with about engine break in and provide the exact (or nearly exact) quotes from them. Along with that knowing the schools and topic of their PhDs would be most insightful. The reason for my request is genuine and 3 fold.
- I don't buy the stark contrast between factory recommended procedures and the hard break in philosophy.
- It is not all that likely that some random motorbike mechanic (your existing reference) is in perfect agreement with a typical F1 team. Either way the quality of this source is not at all up to that of your other sources you mention.
- If your sources really are that good, I (and probably the forum members in general) stand to learn quite a bit on this topic and it may alter our behaviors in the future.
Thanks in advance.