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9.5 quarts too much?

Engine

Model: Boxster S, Year:2003, Mileage:68000, Type of use:Street use only
I changed the oil and added 9 quarts of oil and the dipstick was in the middle of the band and the digital gage had 3 segments not lit. I added 1/2 a quart and the dipstick indicates full and all segments are lit on the digital oil level gage. Is 9.5 quarts ok? How much oil would cause foaming and possibly damage the engine?

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