Перелив масла с остатками в выпускном коллекторе
Can overfilling your oil cause oil residue in your exhaust manifold without you breaking a ring?
Перевод вопроса с Mechanics Stack Exchange
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Оригинальный вопрос: https://mechanics.stackexchange.com/questions/37512/oil-overfill-with-residue-in-exhaust-manifold
Oil can be forced out of the crankcase breather which usually vents into the air-box, would then be sucked through the engine and end up in the exhaust so that is a possibility.
It's also possible to get oil in the exhaust past the valve stem seals or the turbo (if fitted) seals. Neither of these is particularly good.
Best advice is, drain the excess oil and refill to the correct level.
Good luck.