[Elite Engineering]

Here are GM's instructions (from LS new engines, but still the same for LT):





And the rear diff should be done by 1000 miles!!!! BMWD is correct. This is really the only other portion of the drive-train that needs to "break in" as the gears mesh in and clutches/steels shed material in that initial few hundred miles. Leaving that in greatly contributes to wear.


I would never leave the initial oil fill in longer than a few hundred mile. As the GM instructions show, drain immediately after ring seating.