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I highly doubt that the dealer didn't change the oil.
Often times the synthetics will look "dirty" even after a couple of weeks.
Think about it, you really have no proof. You're just basing it on the oil level reading being the same (doesn't sound that strange to me). If you're that worried about it, just change it again. However, I don't think you have anything that would justify the dealer doing it again for free.
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