Originally Posted by GalidiinaeSRT
No need to wait for a "break in period". The best running engines are broke in hard. You need to seat the ringlands against the cylinder walls and that happens with cylinder pressure, AKA full throttle! Start banging out some 0-60s! Anyways the most crucial part of engine break in is the first few miles.
Listening to you, a lot of people are going to trash their engines.
The SRT manual would disagree with you, as would the SRT technicians. I asked this exact question, they said that yes, the 6.4 *does* require a break in period.
500 miles / 800 kms is what they suggest, and pretty much every SRT manual says the same thing. If this was a Lambo or Ferrari, then i agree with you as they're run hard before we get them - but the 6.4 Hemi is not one of those engines.