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Probably not serious damage, but it could be a big mess if you drive it any more. I would for sure drain the oil tank and measure how much comes out. You're going to need a very big pan or bucket. I would put in 5 quarts less, warm it up and then see where the level is. Remember, not only should the engine be idling, but the oil should be warmed up to operating temperature to get an accurate measurement. Most of us run it at just above the add mark on the stick.
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1990 964 Coupe
1986 Carrera 3.2 Targa
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