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The manual says there is no break in period. However diesels dont really break in untill close to 70K right??
You are not far off. My Duramax finally stopped burning oil at 80K. I guess it wasn't made to just carry groceries.


The best way to break in any engine is to vary engine speed as much as possible during the break in period.
 

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How can you tell once its broken in? Do you just wait till about 70k or is there something else that can tell you that its broken in?
In my case, I noticed that the oil consumption went way down from a quart in 1500 miles to maybe a half quart in 5000 miles. I suspect that it took a long time because of light duty driving.
 
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