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don't know how much over your oil level is but.....
Over filling an engine with oil can and will poison the O2 sensors and the cat. Remember if you are over the max line on a cold engine it is way over on a hot engine
Ignoring the sensors and cat - too much oil will also decrease available power and fuel economy due to parasitic drag of the to much oil hitting the crankshaft. It can also cause there to be too much oil pressure which can lead to oil leaks down the road.
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