We use a very specific break in procedure on our engines. The same can be followed on a new motor
We pull oil filter at 25 min/miles
250 change again
500-750 change again (we use breakin oil up to this point)
1500 change again to conventional race oil.
3500 we recommend you get Oil analysis and based on it we recommend you change to synthetic or one more conventional oil. After this letteeeer rip.
Why so often? This is a pretty standard performance engine breakin procedure, not oem engine breakin procedure. A bit much, yes. But we find wear metals really decline at 3000-3500 miles and rings fully seat. We like getting all the wear metals out as often as possible. Driving locked in gear using engine breaking to naturally slow you down allows the engine to see vacuum which is better for ring seal. Try to stay out of boost, but vary loads, try to not idle often.
Just my $.02
Just curious...who is "We..." ? You a professional engine builder shop? Not being snotty here, more curious to how you developed such a thorough breakin procedure.