Engine Break-In Interval?

[OK-944]

Royal Purple says to allow for between 500 and 2,500 miles of their break in oil before changing to whatever.

But when I do a bit of math…multiplying my approximate break-in rpm average by my estimated total driving time - I come up with a figure of between 800,000 and 1,000,000 total engine revolutions. This includes initial 2000rpm warmup (w/cheap dino oil), followed by a bit of moderately aggressive ring setting (w/RP break in oil), followed by another fill of cheap dino (on the premise that a detergent oil will help flush engine of break in debris), and finally another fill of RP break in oil., which I’m still running with.

During the first three to four hours of this break in process (with multiple heat cycles and variety of rpm’s), I’d felt my engine smooth out and gain power (feels great!) - but after then things have not changed. Plus, oil consumption is now basically zero.

My gut says that my engine is broken in, and I’m eager to go to my “final” oil…which is Mobil-1 10/40 which, with its 1kppm of zddp, has worked well for me with 3 944’s.

There are those who say that if I insist on going to a synthetic, to first (after break-in) give the engine a couple of thousand miles of a high quality, high zddp dino oil - but as I retained the original camshaft, lifters, and valves (which I mildly/gently lapped)…I don’t really see the value in this approach, save (perhaps) for the fact that dino oil may facilitate more effective swelling of new engine seals.

Then again…giving my engine some extra miles of dino oil might also assume that “new” seals employ materials identical to their 34 year old equivalents. Is this assumption correct?