My 5.9 still continues to build more power even at 13k.
> Typical rule of thumb is 500 miles.
> Subject: DML: Engine break in (4.7)
>
> > Is there a rule of thumb for how long it takes an engine to be broken in
>
> . The one with more mileage had A LOT
> > more zip to it. (Please, try to resist saying the engine is broke in
> > someplace between 50 & 1,2xx.
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