Slight Disagreement:
OVERFILLING can and will cause Engine damage. It increases oil pressure; causes various other problems - and can definitely blow out seals. That is why a maximum oil fill level exists.
You were leaking oil when you checked on the level - and you had already lost oil; and you were still 1/2 quart over full.
You should talk to your shop about it. They mistakenly overfilled it. Not good.
To fix - the blown seals will now need to be replaced.
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Sunday, February 3rd, 2013 AT 4:00 PM