quote:The factory may dyno run these new engines on mineral, then factory fill.
No so with Corvette production. And, besides, if it added two cents to the cost, changing oil, no factory would do it.
We have a racing program and put synthetic oil in for assembly and first run on the dyno. I read the aircraft break in procedure and the only part that I would not follow is holding the engine at idle speed on first startup. We start engines and take them to 2,500 rpm and hold them there for about 15 to 30 minutes while looking for problems. We feel that engines oil better with a little more crank speed. After that we shut down, check everything, let the engine heat cycle to cold and start the power runs on the dyno to get the engine tuned up and ready for some track time.
We've done leak down tests on new cars and pickups, and have never found one that did not pass, brand new. You don't perform well on a leak down if the rings are not completely seated.