I hope whomever you were talking to had more basis for that determination than you've just provided us.... Oil entering the cylinders could come from a large number of places (might not even be oil; a lot of people mistake excessive fuel for oil in the exhaust). Would you mind giving us more specifics? Which engine?
Turbo or N/A? Have you done compression and leak down tests? Are either the oil or coolant contaminated with the other? Anything that looks like chocolate pudding in the oil cap? Is the coolant caustic? Is there a significant amount of oil in the intake piping?
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