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If your engine is allowing raw oil into the exhaust, yes. An oil fouled catalytic converter does not perform it's job. But that's usually an indication of other problems as well.

More commonly, too much oil will cause increased pressure against the main seals or may damage the pan gasket. It can also contribute to foamy oil which can cause problems with lifters and create irregularities in the pressurized oil lines that maintain the main, rod and camshaft bearings.

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Q: Will having too much oil in your car really damage the catalytic converter?
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