[brillo]

So I've read all the break in threads and I still haven't seen a logical arguement for keeping the engine under 4,000rpm for the first 1,000 miles (i.e. a soft break in).

Now I realize that the manual recommends a soft break in (and I understand why people would choose to follow this), but I haven't seen an engineering/technical justification (I've seen plenty of arguements for a more robust break in procedure). I've even searched the web in general for technical arguements for a soft break in but found nothing.

Making sure the engine is warmed up and no holding a constant speed for the first 500-1000 makes good sense, but not exceeding 4,000rpm is still a mystery to me. I'm not suggesting the sportbike approach, but driving between 0 and 6,000rpm for the first 500-1,000mi just seems like a good way to make sure everything is properly broken in and heat cycled.