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You know, if you put the wrong oil in on your own and then came to the dealer with a motor issue, they would be quick to blame you for the issue telling you that you were using the wrong oil.
If the receipt shows they used the wrong oil, I would go back with your manual and ask them to change it to the correct viscosity. The 10W-30 may not have even been synthetic! Doubt it would "hurt" the engine, but who knows! Make them do it right!
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