At the race track new motors are run like they were built to run twenty minutes after startup. After making sure everything is working as it should. Of course, they have opened up bearing tollerances that allow that practice. Probably doesn't have relevance here though. BTW, I changed my oil at 100 miles, 500 miles, 1000 miles and then again at 1500 with mobil 1. I now have 60k miles and I hardly use any oil. So, I guess everyone is still confused.