I seriously doubt that it matters much one way or the other. Modern car engines are manufactured to such high tolerances that there's virtually no break in. Major improvements in cylinder wall finish and ring design/materials means that it would be very hard to screw-up your break in by glazing your cylinder walls. Everything will mesh together essentially the same whether you're taking it easy or driving it hard.

Some people like to switch out the expensive synthetic oil for regular oil for break in, but it's completely unnecessary due to the design of modern engines. In fact, I wouldn't want to subject regular oil to the extreme temperatures inside a turbo.

When I get my Evo, I'm just going to drive it like usual. I'll keep the RPM's low until it warms up, then anything goes.

 

My car had 23 miles on in when i bought it. i drove it like i stole it from day one.... I have no problems at all and i'm at 24k miles. i think the break in process is bull****

 

i myself waited about 1500 miles and not going anywhere past 5,000 rpm. but i remember being told by someone that suposedly alota cars are comeing from the factory already broken in. in this case they told my buddy who purchased an rx-8 they said dont worry its already been broken in by factory. i dont know if this is true but does sound somewhat logical.

 

Most modern engines after manufacturing are tested at high rpms.

Also racing engines dont need Brake-In! Imagine if racing cars would need brake-in for clutch, engines, etc....

 

I hammered both my Evos from the start and will continue to do so with every one I get down the road.

 

I toured the Corvette factory ~10 yrs ago; every car gets put on rollers for a dyno run to check it out. The lucky guy runs the car at WOT and had them going sideways on the rollers with the speedo way over 100 MPH. I'd bet every new performance car in every factory gets dogged this way before shipment.

I hit 7000 rpm in my 4G63 turbo Talon right off the lot when it was new. It has 261,000 miles and the head has never been off; it burns 1 qt of oil ever 1000 miles. Easy break in doesn't hurt but IMO is not necessary.