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presuming you did have an overfill the oil would be making its way back though the intake to be burnt off even if you can´t find it. I´d recommend draining off a quart immediately and then checking the level again when the car gets up to temp. The car washed might simply have washed oil from somewhere onto the exhaust parts. I´ve heard of an oil leak in one of the front lines washing oil into the tray on the underside of the car. Have you checked for any possible leaks?
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