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For the life of the oil, I would suggest pulling samples before you add oil or do a change, and get them tested to see what condition your oil is in.
The other aspect of that, is that even though you are adding oil, you are not exporting any contaminants, or changing your filter, until you do the oil change. Personally, I would be at least changing the filter more frequently, even if the oil is still in good shape.
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