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Overfilling the oil could cause oil to get into the catalytic converters, where they can do damage. My 01S had an oil leak from the RMS when I bought it, the previous owner kept it overfilled to prevent the oil from getting too low. Ever since I fixed the RMS and changed the oil, and put it the correct level, the engine will occasionally get a CEL with DTC code P0420 that routinely keeps coming up. If you have changed the oil before, the oil filter holds about a 1/2 quart, you can pull it and dump out the oil and then screw it back in. It could put you in the right oil level range without pulling the oil drain plug.
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