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I also followed the break-in recommendations.
I never needed to add oil between changes (closing on 45k miles and the ///M is seeing plenty of track time).
If one elects of not following the break-in interval, my understanding is that the break-in oil should be changed before the engine is operated beyond the specified break-in limitations. The different composition of the break-in oil and any contaminants present (manufacturing residue) may have a negative impact on the engine.
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