- Jul 2, 2007
Yay, another break-in thread !! It's an interesting topic, but pretty sure all manufacturers include a form of cold run-in at the motor assembly plant before transferring the engines to the vehicle assembly line. For what it's worth, like others here, I broke mine in using the high load limited rpm model. Once at operating temp, which comes up quickly in the Ford twin turbo 2.7 due to engine coolant circulated through the turbo housings in exhaust manifolds... once at temp I would give it some juice but let off before exceeding 75% of tach redline, and then let it decelerate a bit by engine braking to balance the break-in with vacuum pulls. The tow/haul driving mode was perfect for that, since it intentionally holds gears sequentially downshifting when you let off, for engine braking when towing. Didn't tow during break-in of course, just selected that driving mode on the shifter. Where I diverged from common practice is I left factory fill in until about 3900 miles. And then used one of my two free dealership oil changes, LoL !! I should be ashamed. None of that may have made any difference, but it made me feel satisfied that I "did it right." Ha.