This is a Mercedes C180T (WDB 202081) with the 2L M111 952 engine.
Long story short: Had a leaky cam sensor which the Norwegian MB importer never followed up the campaign to fix. Changed the sensor and added small pigtail wire to stop more spillage into the wiring. Since then I've changed MAS twice, new cat and middle silencer and changed the O2 sensors twice. After each change the ECU has been reset and it runs decently for a short while, then it's back to this with the check engine light on. No sign of any oil left in the plugs; so any advice would be very helpful as the mechanics can't seem to find the problem.

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