It could be very expensive.
Once the car done 150,000km and the sludge in the inlet would affect the performance the most people would've consider upgrading the car rather than have expensive repair like cleaning the inlet, intercooler and other parts of intake which could possibly need replacing rather than just cleaning.
IMO it will be 200,000km on engine before the sludge from EGR will affect the performance, of course there will be some engines which will clog up earlier than that.
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